Debt - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Carrying Amount [Member] | Senior Secured Credit Facilities [Member]
Financial liabilities:
Credit facility	$ 2,064,675	$ 2,220,000
Carrying Amount [Member] | 5.875% Senior Notes due 2023 [Member]
Financial liabilities:
Senior notes	600,000	600,000
Fair Value [Member] | Senior Secured Credit Facilities [Member]
Financial liabilities:
Credit facility	2,059,770	2,202,105
Fair Value [Member] | 5.875% Senior Notes due 2023 [Member]
Financial liabilities:
Senior notes	$ 613,500	$ 616,500