Income Taxes - Benefit for Income Taxes and Effective Income Tax Rate (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
Income Tax Disclosure [Abstract]
Benefit for income taxes	$ (527)	$ (406)	$ (510)	$ (6,337)
Effective income tax rate	(12.60%)	(31.10%)	(3.50%)	(37.70%)