Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity [Abstract]
Other comprehensive income (loss) before reclassification adjustments	$ 0	$ 0	$ 0	$ 0
Amounts reclassified from AOCI, before tax	$ 100,000	$ (100,000)	$ 200,000	$ (200,000)