Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill And Intangible Assets [Line Items]
Amortization expense	$ 2,100	$ 2,100	$ 6,384	$ 6,437
Estimated Amortization Expense for Intangible Assets [Member]
Goodwill And Intangible Assets [Line Items]
Remainder 2016	2,000		2,000
Year 2017	8,300		8,300
Year 2018	8,300		8,300
Year 2019	8,300		8,300
Year 2020	8,300		8,300
Thereafter	$ 16,100		$ 16,100