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Debt - 2023 Senior Notes and Redemption of 2020 Senior Notes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Apr. 16, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
May 01, 2015
Debt Instrument [Line Items]                
Loss on extinguishment of debt   $ 0 $ 0   $ 0 $ 33,317,000    
5.875% Senior Notes due 2023 [Member]                
Debt Instrument [Line Items]                
Stated interest rate of senior notes (as a percent)   5.875%     5.875%   5.875%  
5.875% Senior Notes due 2023 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Stated interest rate of senior notes (as a percent)   5.875%     5.875%      
5.875% Senior Notes due 2023 [Member] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Senior Notes issued amount $ 350,000,000              
Stated interest rate of senior notes (as a percent) 5.875%              
Loss on extinguishment of debt       $ 33,300,000        
Senior Notes, maturity date         Apr. 15, 2023      
Redemption price (as a percent) 100.00%              
7.75% Senior Notes due 2020 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Stated interest rate of senior notes (as a percent)               7.75%
7.75% Senior Notes due 2020 [Member] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Percentage of redemption price, principal amount of debt 105.813%