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Long-Term Debt - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||||||||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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May 31, 2008
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Jul. 05, 2007
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
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Apr. 30, 2011
Secured Debt [Member]
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Dec. 31, 2013
Secured Debt [Member]
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Dec. 31, 2012
Secured Debt [Member]
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Dec. 14, 2012
Secured Debt [Member]
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May 15, 2008
Secured Debt [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
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Dec. 31, 2012
Revolving Credit Facility [Member]
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Dec. 31, 2013
Existing Credit Agreement [Member]
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Dec. 31, 2013
Minimum [Member]
Revolving Credit Facility [Member]
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Jul. 15, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
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May 31, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
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Jul. 15, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
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May 09, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
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Jul. 05, 2007
2.125% Convertible Senior Notes, due July 2012 [Member]
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Dec. 31, 2013
9.125% Senior Notes, due April 2018 (Issued March 22, 2010) [Member]
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Mar. 22, 2010
9.125% Senior Notes, due April 2018 (Issued March 22, 2010) [Member]
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Apr. 25, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Dec. 31, 2013
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Dec. 31, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Dec. 31, 2013
7.50% Senior Notes, due August 2020 [Member]
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Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
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Mar. 22, 2010
Senior Notes One [Member]
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Mar. 22, 2010
Line of Credit [Member]
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May 09, 2012
Convertible Notes Payable [Member]
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Sep. 30, 2012
Convertible Notes Payable [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
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Jul. 30, 2013
Term Loan [Member]
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Dec. 31, 2013
Term Loan [Member]
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Dec. 31, 2012
Term Loan [Member]
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Dec. 14, 2012
Term Loan [Member]
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May 31, 2008
Term Loan [Member]
Secured Debt [Member]
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Dec. 31, 2013
Term Note Due April Twenty Eighteen [Member]
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Jul. 30, 2013
Term Note Due April Twenty Eighteen [Member]
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Dec. 31, 2013
Senior Notes Other [Member]
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Jul. 30, 2013
Secured Debt [Member]
Goldman Term Loan [Member]
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Apr. 18, 2013
Secured Debt [Member]
Goldman Term Loan [Member]
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Jan. 22, 2014
Subsequent Event [Member]
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Jan. 22, 2014
Subsequent Event [Member]
6.75 Percent Senior Notes, due July 15, 2022 [Member]
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Jan. 22, 2014
Subsequent Event [Member]
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Jan. 07, 2014
Subsequent Event [Member]
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
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Jan. 22, 2014
Subsequent Event [Member]
Tendered Bonds [Member]
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Dec. 31, 2013
Prior to August1, 2016 [Member]
7.50% Senior Notes, due August 2020 [Member]
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Jan. 22, 2014
Prior to August1, 2016 [Member]
Subsequent Event [Member]
7.50 % Senior Notes [Member]
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Dec. 31, 2013
On and after August 1, 2016 [Member]
7.50% Senior Notes, due August 2020 [Member]
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Jan. 22, 2014
On and after August 1, 2016 [Member]
Subsequent Event [Member]
7.50 % Senior Notes [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Current portion of long-term debt | $ 25,000,000 | $ 10,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Repayments of principal in 2018 | 3,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Repayments of principal after 2018 | 628,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Aggregate principal amount | 125,000,000.0 | 125,000,000.0 | 300,000,000.0 | 125,000,000.0 | 225,000,000 | 125,000,000.0 | 125,000,000 | 360,000,000.0 | 416,200,000.0 | ||||||||||||||||||||||||||||||||||||||||
| Revolving loan outstanding | 50,000,000 | 0 | 0 | 40,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Repayments of long-term debt | 125,000,000 | 0 | 0 | 45,000,000 | 416,200,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Deferred acquisition costs | 5,100,000 | 5,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument fixed interest rate | 9.125% | 9.125% | 9.125% | 7.50% | 7.50% | 9.625% | 2.125% | 6.75% | 9.125% | 9.125% | |||||||||||||||||||||||||||||||||||||||
| Refinanced amount | 400,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Repayments of debt | 225,000,000 | 42,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Par value of senior notes | 104.00% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Gross proceeds of aggregate principal amount additional issued | 130,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Repurchase of Convertible senior notes | 122,900,000 | 122,900,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Notes paid off | 2,100,000 | 2,100,000 | 8,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Debt issuance costs | 11,600,000 | 7,100,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Debt issuance cost, Net of amortization | 7,700,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of the aggregate principal amount redeemed | 35.00% | 35.00% | |||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of redemption price before notice | 107.50% | 106.75% | 103.75% | 10337.50% | |||||||||||||||||||||||||||||||||||||||||||||
| Percentage of redemption price after notice | 104.563% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of repurchase | 101.00% | 101.00% | 10100.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Redemption date | Apr. 01, 2014 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Tender offer price for each 1000 principal amount | 1,003.27 | 1,061.98 | 1,061.98 | ||||||||||||||||||||||||||||||||||||||||||||||
| Unit for which the tender offer price is calculated | 1,000 | 1,000.00 | |||||||||||||||||||||||||||||||||||||||||||||||
| Tender offer price per note, consent payment | 30.00 | 30.00 | |||||||||||||||||||||||||||||||||||||||||||||||
| Payments of debt issuance costs | 11,172,000 | 4,859,000 | 504,000 | 453,700,000 | |||||||||||||||||||||||||||||||||||||||||||||
| One time debt extinguishment cost | 1,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Senior secured credit facility | 80,000,000.0 | 80,000,000 | 50,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Increase in the amount of term loan or revolving credit facility | 50,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Aggregate commitment amount | 180,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Maturity of credit facility | Dec. 14, 2017 | May 14, 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan | 2.50% | 2.75% | |||||||||||||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan | 3.00% | 3.25% | |||||||||||||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan | 1.50% | 1.75% | |||||||||||||||||||||||||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan | 2.00% | 2.25% | |||||||||||||||||||||||||||||||||||||||||||||||
| Letters of credit outstanding | 4,600,000 | 4,500,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Term loan | 50,000,000 | 50,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Principal payments | 2,500,000 | 6,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Base rate plus | 2.00% | 2.25% | 200.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| LIBOR plus | 3.00% | 3.25% | 300.00% | 3.21% | |||||||||||||||||||||||||||||||||||||||||||||
| Tender offer costs | 25,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued interest | $ 11,700,000 | ||||||||||||||||||||||||||||||||||||||||||||||||