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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 07, 2016
Aug. 15, 2012
Aug. 13, 2009
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 04, 2016
Dec. 31, 2015
Mar. 18, 2013
May 23, 2011
Class Of Stock [Line Items]                        
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises             $ 563,000          
Warrant                        
Class Of Stock [Line Items]                        
Weighted average contractual term of awards outstanding and exercisable             1 year 7 months 6 days 2 years 4 days        
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018                        
Class Of Stock [Line Items]                        
Debt instrument, interest rate, stated percentage       1.50%   1.50% 1.50% 1.50%   1.50% 1.50%  
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016                        
Class Of Stock [Line Items]                        
Debt instrument, interest rate, stated percentage       2.50%   2.50% 2.50% 2.50% 2.50% 2.50%   2.50%
Stock Options                        
Class Of Stock [Line Items]                        
Compensation expense related to stock grants       $ 0   $ 0 $ 0 $ 0        
Restricted Stock                        
Class Of Stock [Line Items]                        
Compensation expense related to stock grants       1,200,000   3,900,000 4,700,000 9,800,000        
Compensation cost not yet recognized       8,800,000     $ 8,800,000          
Compensation cost not yet recognized, period for recognition             3 years          
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises           $ 900,000 $ 600,000 $ 15,500,000        
Share based compensation awards granted in period             2,123,971          
Restricted Stock | Maximum                        
Class Of Stock [Line Items]                        
Share based compensation awards vesting period             3 years          
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises       $ 100,000                
Retention Stock                        
Class Of Stock [Line Items]                        
Compensation expense related to stock grants             $ 1,400,000          
Share based compensation awards vesting period 3 years                      
Share based compensation awards granted in period 7,500,000                      
Share based compensation awards granted in period, value $ 1,300,000                      
Stock Incentive Plan 2009                        
Class Of Stock [Line Items]                        
Number of common stock shares authorized under Equity Incentive Plan     3,000,000                  
Plan expiration date     Aug. 13, 2019                  
Amended and Restated Stock Incentive Plan 2009                        
Class Of Stock [Line Items]                        
Number of common stock shares authorized under Equity Incentive Plan   7,000,000                    
Plan expiration date   Aug. 15, 2022                    
Number of additional common stock shares approved for issuance under amended and restated 2009 Equity Incentive Plan   4,000,000                    
Common stock available for issuance       0     0          
Previous Plan                        
Class Of Stock [Line Items]                        
Common stock available for issuance       0     0          
Long Term Incentive Compensation                        
Class Of Stock [Line Items]                        
Share based compensation awards granted in period         707,028              
Share based compensation awards granted in period, value         $ 6,400,000              
Description of new plan             Other than for Mr. Haugh, the PSUs cliff vest over three years based on the achievement of operating income performance targets established by the Compensation Committee. One-third of Mr. Haugh’s PSUs shall be converted to time-based awards on December 31, 2016, December 31, 2017 and December 31, 2018, based on the achievement of operating income performance targets established by the Compensation Committee, and such time-based awards shall vest and be settled on December 31, 2018.          
Long Term Incentive Compensation | RSUs                        
Class Of Stock [Line Items]                        
Share based compensation awards vesting period         3 years              
Long Term Incentive Compensation | RSUs | Other Than Mr Haugh                        
Class Of Stock [Line Items]                        
Share based compensation form of wards percentage         33.00%              
Long Term Incentive Compensation | RSUs | Mr. Haugh                        
Class Of Stock [Line Items]                        
Share based compensation form of wards percentage         25.00%              
Long Term Incentive Compensation | PSUs | Other Than Mr Haugh                        
Class Of Stock [Line Items]                        
Share based compensation form of wards percentage         67.00%              
Long Term Incentive Compensation | PSUs | Mr. Haugh                        
Class Of Stock [Line Items]                        
Share based compensation form of wards percentage         75.00%              
July 2013 Program                        
Class Of Stock [Line Items]                        
Accounts payable and accrued expenses       $ 13,300,000     $ 13,300,000          
February 2014 Program                        
Class Of Stock [Line Items]                        
Accounts payable and accrued expenses       $ 500,000,000     $ 500,000,000