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Debt - 2023 Senior Notes and Redemption of 2020 Senior Notes - Additional Information (Detail) - USD ($)
3 Months Ended
Apr. 16, 2015
Mar. 31, 2017
Jun. 30, 2015
May 01, 2015
5.875% Senior Notes due 2023 | Unsecured Debt        
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  
Redemption price (as a percent)   100.00%    
5.875% Senior Notes due 2023 | Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate of senior notes (as a percent)   5.875%    
7.75% Senior Notes due 2020 | Unsecured Debt        
Debt Instrument [Line Items]        
Percentage of redemption price, principal amount of debt 105.813%      
7.75% Senior Notes due 2020 | Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate of senior notes (as a percent)       7.75%