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Debt - 2021 Senior Notes - Additional Information (Detail) - 5.25% Senior Notes due 2021 - Senior Notes - USD ($)
3 Months Ended
Apr. 16, 2013
Mar. 31, 2017
Debt Instrument [Line Items]    
Senior Notes issued amount $ 550,000,000  
Stated interest rate of senior notes (as a percent) 5.25% 5.25%
Redemption price (as a percent) 101.00% 102.625%