Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax provision	$ 1,817	$ 1,873	$ 3,455	$ 3,347
Liability for income taxes associated with uncertain tax positions	6,386		6,386
Tax benefits associated with potential transfer pricing adjustments			1,390
Tax benefits associated with state income taxes	4,015		4,015
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate	981		981
Unrecognized tax benefit liabilities decrease	339		339
Gross liability for uncertain tax positions decrease	62		173
Provision for income taxes related to interest and penalties	10	$ 64	35	$ 23
Income tax accrued for payment of interest and penalties	$ 1,027		$ 1,027		$ 1,062