Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leased Assets [Line Items]
Operating lease expiration year	2022
Rent expense	$ 7,200,000	$ 6,700,000	$ 7,500,000
2016	5,912,000
2017	6,250,000
2018	3,845,000
Related Party Transaction
Operating Leased Assets [Line Items]
Rent expense	1,800,000	$ 1,700,000	$ 1,700,000
2016	1,900,000
2017	1,900,000
2018	$ 14,000