Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income taxes, net	$ 15,811	$ 10,706	$ 38,662	$ 31,168
Effective tax rate	42.60%	42.60%	42.60%	41.80%