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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, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]          
Non-cash goodwill impairment, per share     $ 0.14mso_NonCashGoodwillImpairmentPerShare    
Restructuring charges $ (3,600)us-gaap_RestructuringCharges $ (2,800)us-gaap_RestructuringCharges $ (3,637)us-gaap_RestructuringCharges [1] $ (3,439)us-gaap_RestructuringCharges [1] $ (4,811)us-gaap_RestructuringCharges
[1] As disclosed on the Company's consolidated statements of cash flows, total non-cash equity compensation expense was $2.1 million, $2.0 million and $3.9 million in 2014, 2013 and 2012, 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 2014 of approximately $0.03 million, which were generated in connection with restructuring activities. Accordingly, these amounts are reflected as restructuring charges in the Company's 2014, 2013 and 2012 consolidated statements of operations. See Note 17, Restructuring Charges for further information.