Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 129,580		$ 129,580	$ 123,031
Total other intangible assets, net	105,450		105,450	$ 100,935
Amortization expense of intangible assets	2,913	$ 2,963	5,667
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder of 2015	6,200		6,200
2016	12,400		12,400
2017	12,000		12,000
2018	10,500		10,500
2019	9,300		9,300
2020	4,400		4,400
After 2020	$ 2,700		$ 2,700