Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Valuation allowance for deferred tax assets	$ 164,616
Income tax provision	1,401	$ 1,638
Liability for income taxes associated with uncertain tax positions	7,061
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate	901
Unrecognized tax benefit liabilities decrease	183
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	29
Provision expense (benefit) for income taxes related to interest and penalties	24	$ 25
Income tax accrued for payment of interest and penalties	$ 1,035		$ 1,060