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	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax provision	$ 304	$ 1,037	$ 3,651	$ 4,941
Liability for income taxes associated with uncertain tax positions	6,321		6,321
Tax benefits associated with potential transfer pricing adjustments			2,024
Tax benefits associated with state income taxes	3,176		3,176
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate	1,121		1,121
Unrecognized tax benefit liabilities decrease	426		426
Gross liability for uncertain tax positions decrease	4,838
Provision for income taxes related to interest and penalties	31	58	55	150
Income tax accrued for payment of interest and penalties	$ 1,108		$ 1,108		$ 1,163