Goodwill and Other Intangible Assets - Components of Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 320,761	$ 335,402	$ 345,453	$ 364,328
Other intangible assets (net of accumulated amortization)	6,215	12,036
Goodwill and other intangible assets, Total	$ 326,976	$ 347,438