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]
Uncertain tax positions	$ 398		$ 398		$ 1,846
Decrease in uncertain tax positions resulting from the expiration of the statute of limitations			1,400
Uncertain tax position liability recovery	837
Recovery of (provision for) income taxes	$ (432)	$ 109	$ (194)	$ 434