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Debt - 2024 Senior Notes - Additional Information (Detail) - 5.625% Senior Notes due 2024 [Member] - USD ($)
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Mar. 05, 2014
Debt Instrument [Line Items]      
Stated interest rate of senior notes (as a percent) 5.625% 5.625%  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes issued amount     $ 350,000,000
Stated interest rate of senior notes (as a percent) 5.625%   5.625%
Senior Notes, maturity date Mar. 01, 2024    
Redemption price (as a percent) 100.00%