Income Taxes - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
(Benefit from) provision for income taxes	$ 1,613,000	$ (1,016,000)
Unrecognized tax benefits	21,300,000
Reduction in unrecognized tax benefits	$ 1,700,000