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Debt - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Convertible Senior Notes
Jun. 30, 2012
Convertible Senior Notes
Unsecured Debt
Apr. 23, 2012
Convertible Senior Notes
Unsecured Debt
Jun. 30, 2012
Convertible Senior Notes
Unsecured Debt
Scenario 1
Jun. 30, 2012
Convertible Senior Notes
Unsecured Debt
Scenario 1
Minimum
Jun. 30, 2012
Convertible Senior Notes
Unsecured Debt
Scenario 2
Day
Jun. 30, 2012
Revolving Credit Facility
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Letter of Credit
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Swing Line Loan
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
LIBOR
Minimum
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
LIBOR
Maximum
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Base Rate
Minimum
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Base Rate
Maximum
Jun. 30, 2012
Revolving Credit Facility
Amended and Restated Credit Agreement
Option to increase subject to certain conditions
Jun. 30, 2012
Term Loan Credit Facilty
Jun. 30, 2012
Term Loan Credit Facilty
Jun. 30, 2012
Term Loan Credit Facilty
Maximum
Jun. 30, 2012
Term Loan Credit Facilty
Through September 30, 2013
Minimum
Jun. 30, 2012
Term Loan Credit Facilty
Through September 30, 2013
Maximum
Jun. 30, 2012
Term Loan Credit Facilty
Thereafter through September 30, 2015
Minimum
Jun. 30, 2012
Term Loan Credit Facilty
Thereafter through September 30, 2015
Maximum
Jun. 30, 2012
Term Loan Credit Facilty
Thereafter
Minimum
Jun. 30, 2012
Term Loan Credit Facilty
Thereafter
Maximum
Jun. 30, 2012
Term Loan Credit Facilty
LIBOR
Jun. 30, 2012
Term Loan Credit Facilty
Base Rate
May 08, 2012
Term Loan Credit Facilty
Senior Secured Credit Facility
May 08, 2012
Term Loan Credit Facilty
Incremental Senior Credit Facility
Line of Credit Facility [Line Items]                                                                
Notes issued, due date             2018                                                  
Notes issued, aggregate principal amount         $ 150,000,000 $ 150,000,000 $ 150,000,000                                                  
Notes issued, interest rate             3.375%                                                  
Notes issued, interest payment frequency           Semi-annually                                                    
Notes initial conversion rate per 1,000 in principal amount           85.4372                                                    
Principal amount of notes conversation for 85.4372 shares of common stock           1,000                                                    
Notes initial conversion price $ 11.70   $ 11.70     $ 11.70                                                    
Convertible notes, conversation date           Nov. 01, 2017                                                    
Number of trading days                 20 days                                              
number of consecutive trading days               30 days   5 days                                            
Last reported sale price of common stock as percentage of conversion price                 130.00%                                              
Number of business days                   5                                            
Convertible senior notes, trading price per $1,000 principal amount of notes as percentage of the product of the last reported sale price of common stock and the conversion rate                   98.00%                                            
Proceeds from notes issued     292,500,000     145,100,000                                                    
Estimated implied interest rate           7.00%                                                    
Fair value of liability component upon issuance           123,800,000                                                    
Difference between cash proceeds before offering expenses and the estimated fair value of liability component           21,700,000                                                    
Proceeds from issuance of convertible senior notes           145,500,000                                                    
Credit facility, amount repaid     234,180,000 519,459,000             51,000,000                                          
Credit facility, maturity date                       May 08, 2017                 May 08, 2019                      
Credit facility, borrowing capacity                       150,000,000 15,000,000 10,000,000         200,000,000                       300,000,000 75,000,000
Credit facility, interest rate above basis                             1.75% 2.25% 0.75% 1.25%                     4.75% 3.75%    
Credit facility, unused line fee monthly payment                       0.375%                                        
Required minimum fixed charge coverage ratio when availability under the Revolver is less than 12.5% of the total revolving commitment                       1.1                                        
Excess availability as a percentage of total revolving commitment below which minimum fixed charge coverage ratio maintained                       12.50%                                        
Availability percentage of total revolving commitment below which amounts in deposit accounts will be transferred daily into a blocked account                       15.00%                                        
Credit facility, outstanding                       25,000,000                                        
Credit facility, expected mature days prior to maturity of Notes                                         91 days                      
Loan amortization as a percentage of original principal amounts of loans issued                                       1.00% 1.00%                      
Conditions for mandatory prepayments, proceeds from sale of assets                                         1,000,000                      
London interbank offered rate floor                                       1.25% 1.25%                      
Credit facility, interest paid                                       1,600,000                        
Credit facility, principal paid                                       800,000                        
Credit facility, outstanding                                       299,300,000 299,300,000                      
Credit facility, outstanding current 3,000,000   3,000,000                                 3,000,000 3,000,000                      
Credit facility, original issuance discount fees paid     5,026,000 1,281,000                                 7,500,000                      
Credit facility, interest expense $ 5,441,000 $ 1,147,000 $ 6,174,000 $ 2,073,000                               $ 100,000                        
Credit facility covenants, interest coverage ratio                                           16.1 2.0   3.0   4.0          
Credit facility covenants, senior secured leverage ratio                                       2.4 2.4     4.5   4.0   3.5