Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net deferred tax asset	$ 20,927	$ 22,437
Net current deferred tax asset in prepaid and other assets	5,044	3,798
Net non-current deferred tax asset	$ 15,883	18,639
Aggregate Federal NOL carryforwards		61,165
Federal NOLs subject to an annual limitation		20,317
Federal NOLs not subject to an annual limitation		40,848
Federal NOLs annual limitation		$ 2,779