Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Detail)

v2.4.0.6
Long-Term Debt - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
May 31, 2008
Dec. 31, 2012
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Sep. 30, 2012
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Jul. 05, 2007
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Apr. 30, 2011
Secured Debt [Member]
Dec. 31, 2012
Secured Debt [Member]
Dec. 31, 2011
Secured Debt [Member]
May 15, 2008
Secured Debt [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2012
Existing Credit Agreement [Member]
Dec. 31, 2012
Maximum [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
Minimum [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
9.125% Senior Notes, due April 2018 (Issued March 22, 2010) [Member]
Mar. 22, 2010
9.125% Senior Notes, due April 2018 (Issued March 22, 2010) [Member]
Dec. 31, 2012
Senior Notes One [Member]
Dec. 31, 2012
Line of Credit [Member]
Apr. 30, 2012
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
Dec. 31, 2012
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]
Dec. 31, 2012
Term Note [Member]
Dec. 31, 2011
Term Note [Member]
Dec. 31, 2012
Term Note [Member]
Dec. 31, 2011
Term Note [Member]
May 31, 2008
Term Note [Member]
Secured Debt [Member]
May 31, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
Dec. 31, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
May 09, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
Sep. 30, 2012
2.125% Convertible Senior Notes due July 2012 [Member]
2.125% Convertible Senior Notes, due July 2012 Repayment of Debt [Member]
Dec. 31, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
Jul. 15, 2012
2.125% Convertible Senior Notes, due July 2012 [Member]
Dec. 31, 2011
2.125% Convertible Senior Notes, due July 2012 [Member]
Debt Instrument [Line Items]                                                                  
Long Term Debt , Unamortized Premium $ 4,200,000                                                                
2013 11,000,000                                                                
2014 10,900,000                                                                
2015 10,800,000                                                                
2016 10,700,000                                                                
2017 and thereafter 435,800,000                                                                
Aggregate principal amount         125,000,000                     300,000,000         125,000,000                   125,000,000   125,000,000
Percentage of notes guaranteed by restricted subsidiaries       2.125%                     9.125%   9.625%                         2.125%      
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        
Notes paid off                                                               2,100,000  
Debt issuance costs                                       11,600,000               3,600,000          
Debt issuance cost, Net of amortization                                       7,600,000                          
Percentage of the aggregate principal amount redeemed                             35.00%                                    
Percentage of redemption price before notice                             109.125%                                    
Percentage of redemption price after notice                             104.563%                                    
Percentage of repurchase                             101.00%                                    
Redemption date                             Apr. 01, 2014                                    
Tender offer price for each 1000 principal amount of 2.125% notes                                                     1,003.27            
Unit for which the tender offer price of 2.125% notes is calculated                                                     1,000            
One time debt extinguishment cost                                                     1,800,000            
Number of common shares under call options     9,027,713                                                            
Strike price of common stock shares     $ 18.29                                                            
Amortization period of debt issuance cost                                                       5 years          
Senior secured credit facility                 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     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%                                          
Revolving loan outstanding             50,000,000 61,000,000   0 0                                            
Letters of credit outstanding                   4,500,000 2,700,000                                            
Term Loan                                           50,000,000   50,000,000                  
Principal payments                                           $ 2,500,000 $ 6,000,000                    
Base rate plus             2.00% 2.25%                                                  
LIBOR Plus             3.00% 3.25%                               3.21% 3.55%