Financial Information for the Company and Its Subsidiaries - Additional Information (Detail)	Mar. 31, 2020	Dec. 31, 2019	Feb. 16, 2016	Sep. 21, 2015	Feb. 11, 2015	Jul. 01, 2014	Mar. 12, 2013
6.125% Senior Notes Due 2021 [Member]
Line of Credit Facility [Line Items]
Debt instrument interest rate	6.125%	6.125%					6.125%
5.125% Senior Notes Due 2022 [Member]
Line of Credit Facility [Line Items]
Debt instrument interest rate	5.125%	5.125%				5.125%
5.625% Senior Notes Due 2023 [Member]
Line of Credit Facility [Line Items]
Debt instrument interest rate	5.625%	5.625%		5.625%	5.625%
6.500% Senior Notes Due 2024 [Member]
Line of Credit Facility [Line Items]
Debt instrument interest rate	6.50%	6.50%	6.50%