Long-Term Debt - Redemption Price, Percentage (Detail) - 6.125% Senior Subordinated Notes due 2027 [Member]	3 Months Ended
	Mar. 31, 2017
Debt Instrument Redemption [Line Items]
Redemption Price	106.125%
Beginning on March 15, 2022 [Member]
Debt Instrument Redemption [Line Items]
Redemption Price	103.063%
Beginning on March 15, 2023 [Member]
Debt Instrument Redemption [Line Items]
Redemption Price	102.042%
Beginning on March 15, 2024 [Member]
Debt Instrument Redemption [Line Items]
Redemption Price	101.021%
Beginning on March 15, 2025 and Thereafter [Member]
Debt Instrument Redemption [Line Items]
Redemption Price	100.00%