Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Liability for unrecognized tax benefits which would impact effective tax rate if recognized	$ 34,879
Increase in liability for unrecognized tax benefits	3,002
Liability for unrecognized tax benefits		$ 31,877
Accrued interest and penalties related to unrecognized tax benefits, net of federal tax benefits	$ 10,337	$ 10,123