Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill deductible for income tax purposes	$ 412,700,000	$ 238,000,000
Amortization expense of intangible assets	$ 49,313,000	$ 32,376,000	$ 19,590,000