Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 162,265		$ 162,265	$ 131,014
Total other intangible assets, net	109,154		109,154	$ 105,103
Amortization expense of intangible assets	3,747	$ 3,238	10,928
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder of 2016	3,800		3,800
2017	14,800		14,800
2018	12,900		12,900
2019	11,000		11,000
2020	5,900		5,900
2021	3,700		3,700
After 2021	$ 2,600		$ 2,600