Long-Term Obligations - Summary of Debt Instrument Redemption (Detail) - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2019
Senior Notes - Due 2026 [Member] | Twelve-Month Period Beginning on August 1, 2021 [Member]
Debt Instrument, Redemption [Line Items]
Percentage of principal amount to be redeemed	103.313%
Senior Notes - Due 2026 [Member] | Twelve-Month Period Beginning on August 1, 2022 [Member]
Debt Instrument, Redemption [Line Items]
Percentage of principal amount to be redeemed	101.656%
Senior Notes - Due 2026 [Member] | Twelve-Month Period Beginning on August 1, 2023 and Thereafter [Member]
Debt Instrument, Redemption [Line Items]
Percentage of principal amount to be redeemed	100.00%
Senior Notes - Due 2023 [Member] | Twelve-month period beginning on August 15 ,2019 [Member]
Debt Instrument, Redemption [Line Items]
Percentage of principal amount to be redeemed	101.531%
Senior Notes - Due 2023 [Member] | Twelve-month period beginning on August 15,2020 and Thereafter[Member]
Debt Instrument, Redemption [Line Items]
Percentage of principal amount to be redeemed	100.00%