Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v2.4.0.8
Long-Term Debt - Additional Information (Detail) (USD $)
9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 14, 2012
Jul. 30, 2013
Unsecured Debt [Member]
Dec. 14, 2012
Secured Debt [Member]
Sep. 30, 2013
Secured Debt [Member]
Sep. 30, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Sep. 30, 2013
9.125% Senior Notes, due April 2018 [Member]
Dec. 31, 2012
9.125% Senior Notes, due April 2018 [Member]
Mar. 22, 2010
9.125% Senior Notes, due April 2018 [Member]
Sep. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
Dec. 31, 2012
7.50% Senior Notes, due August 2020 [Member]
Mar. 22, 2010
9.625% Senior Notes due 2013 [Member]
Sep. 30, 2013
9.625% Senior Notes due 2013 [Member]
Mar. 22, 2010
Senior secured revolving credit facility (Revolver) [Member]
Apr. 30, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
Sep. 30, 2013
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
Apr. 25, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
May 09, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
May 09, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Apr. 25, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Jul. 15, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
Sep. 30, 2013
Term Note [Member]
Dec. 14, 2012
Term Note [Member]
Secured Debt [Member]
Sep. 30, 2013
Term Note Due December 2017 [Member]
Dec. 31, 2012
Term Note Due December 2017 [Member]
Dec. 14, 2012
Term Note Due December 2017 [Member]
Apr. 18, 2013
Secured Debt [Member]
Goldman Term Loan [Member]
Apr. 18, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
Jul. 30, 2013
ITS [Member]
Term Note Due April 2018 [Member]
Jul. 19, 2013
Subsequent Event [Member]
Unsecured Debt [Member]
Jul. 30, 2013
Subsequent Event [Member]
7.50% Senior Notes, due August 2020 [Member]
Debt Instrument [Line Items]                                                                          
Aggregate principal amount                       $ 300,000,000.0   $ 225,000,000.0             $ 125,000,000.0                   $ 125,000,000            
Percentage of notes guaranteed by restricted subsidiaries                   9.125% 9.125%   7.50% 7.50% 7.50%   9.625%           2.125% 2.125%                   7.50%      
Increase in the amount of term loan or revolving credit facility         45,000,000 50,000,000                                                              
Deferred acquisition costs                                                                   5,200,000 5,300,000    
Redemption amount percentage of principal                           35.00%                                              
Redemption price                           107.50%                                              
Redemption price after year three                           103.75%                                              
Redemption price afer year five                           101.00%                                              
Debt premium                                         5,000,000                                
Amortization of premium                                       4,000,000                                  
Par value of senior notes                                     104.00%                                    
Repayments of debt                               225,000,000   42,000,000                                      
Gross proceeds of aggregate principal amount additional issued                                     130,000,000                                    
Repurchase of Convertible senior notes                                           122,900,000                              
Notes paid off                                                 2,100,000                        
Debt issuance costs                                       11,600,000                         5,400,000        
Debt issuance cost, Net of amortization                                       8,100,000                                  
Redemption date                   Apr. 01, 2014                                                      
Percentage of redemption price after notice                   104.563%                                                      
Percentage of repurchase                   101.00%                                                      
Senior secured credit facility           80,000,000.0                                         50,000,000.0                    
Proceeds from issuance of term note                                                               225,000,000         225,000,000
Payments of debt extinguishment costs 0 519,000                                                         5,200,000            
Aggregate commitment amount       180,000,000.0                                                               250,000,000.0  
Maturity of credit facility               Dec. 14, 2017                                                          
Variation in applicable rate for LIBOR Rate Loan               2.50%                                                          
Variation in applicable rate for LIBOR Rate Loan               3.00%                                                          
Variation in applicable rate for Base Rate Loan               1.50%                                                          
Variation in applicable rate for Base Rate Loan               2.00%                                                          
Line of credit facility quarterly decrease in borrowing capacity                                                                       2,500,000.0  
Line of credit facility, maximum borrowing capacity in year two                                                                       42,500,000.0  
Line of credit facility, maximum borrowing capacity in year three                                                                       37,500,000.0  
Revolving loan outstanding               0 0                                                        
Letters of credit outstanding               3,800,000 4,500,000                                                        
Long-term Debt 653,968,000   479,205,000             428,968,000 429,205,000   225,000,000   0                         0 50,000,000 50,000,000       125,000,000      
Principal payments                                                   $ 2,500,000                      
Base rate plus             2.00%                                                            
LIBOR plus             3.00%