Debt - Summary of Debt and Capital Lease Obligations (Parenthetical) (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized deferred financing costs	$ 7,335,000	$ 7,831,000
$400 Million Term Loan B [Member]
Debt Instrument [Line Items]
Total credit facility	400,000,000
Unamortized deferred financing costs	6,457,000	7,737,000
$350 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Senior Notes	$ 350,000,000
Interest rate of Senior Notes	5.00%
Unamortized deferred financing costs	$ 5,107,000	6,078,000
$400 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Senior Notes	$ 400,000,000
Interest rate of Senior Notes	5.00%
Unamortized deferred financing costs	$ 6,469,000	$ 0