Selected Quarterly Financial Data - Additional Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Non-cash goodwill impairment, per share			$ 0.66
Restructuring charges	$ (2,800)	$ (3,500)	$ (3,439)	[1]	$ (4,811)	[1]	$ (5,116)

[1] As disclosed on the Company's consolidated statements of cash flows, total non-cash equity compensation expense was $2.0 million, $3.9 million and $5.0 million in 2013, 2012 and 2011, respectively. Included in non-cash equity compensation expense were net charges to expense of approximately $0.1 million for 2013 and 2012, and reversals of expense in 2011 of approximately $0.5 million, which were generated in connection with restructuring activities. Accordingly, these amounts are reflected as restructuring charges in the Company's 2013 and 2012 consolidated statements of operations. See Note 16, Restructuring Charges for further information.