Intangible Assets and Goodwill - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 12,985,000	$ 9,771,000	$ 11,819,000