Goodwill and Other Intangible Assets - Schedule of Activity in Goodwill and Intangible Assets, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible assets, net
Balance, beginning of period	$ 41,783	$ 44,633	$ 48,711
Acquisition	2,400	1,075	356
Amortization expense	(3,296)	(3,925)	(4,434)
Balance, end of period	40,887	41,783	44,633
Goodwill
Balance, beginning of period	5,260	5,260	5,260
Acquisition	1,441	0	0
Balance, end of period	$ 6,701	$ 5,260	$ 5,260