Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax benefit	$ 3,974	$ 1,116	$ 11,295	$ 6,094
Effective income tax rate	40.10%		42.80%
U.S. federal statutory rate	35.00%		35.00%
Income tax benefits related to recording unrecognized state tax				$ 424,000