Schedule of Debt Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,508,040	$ 1,459,000
Unamortized debt issuance costs	(14,066)	(11,813)
Current portion of long-term debt	(6,193)	(10,000)
Long-term debt, net	1,487,781	1,437,187
Term Loan Due in April 2023
Debt Instrument [Line Items]
Total debt	200,000	85,000
Unamortized debt issuance costs	(100)	(300)
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Total debt	350,000	350,000
Unamortized debt issuance costs	(3,000)	(3,300)
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Total debt	325,000	325,000
Unamortized debt issuance costs	(1,500)	(1,900)
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Total debt	250,000	250,000
Unamortized debt issuance costs	(2,100)	(2,300)
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Total debt	250,000	250,000
Unamortized debt issuance costs	(3,700)	(4,000)
Non-Recourse Mortgage Note 4.5% Due 2033
Debt Instrument [Line Items]
Total debt	24,019
Unamortized debt issuance costs	(300)
Non-Recourse Mortgage Note 4.43% Due 2040
Debt Instrument [Line Items]
Total debt	15,021
Unamortized debt issuance costs	(3,400)
Revolving Credit Facility | Revolving Credit Facility Due in April 2023
Debt Instrument [Line Items]
Total debt	$ 94,000	$ 199,000