Restructuring Activities - Summary of the Activities Associated with Restructuring Liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Liability	$ 1,368	$ 1,368
Charges	2,726	2,726
Cash payments and other non-cash transactions	(1,358)	(1,358)
Severance and employee-related benefits
Restructuring Cost And Reserve [Line Items]
Liability	1,342	1,342
Charges	1,810	1,810
Cash payments and other non-cash transactions	(468)	(468)
Contract termination costs
Restructuring Cost And Reserve [Line Items]
Liability
Impairment of intangible assets
Restructuring Cost And Reserve [Line Items]
Liability
Charges	920	920
Cash payments and other non-cash transactions	(920)	(920)
Other restructuring costs
Restructuring Cost And Reserve [Line Items]
Liability	26	26
Charges	(4)	(4)
Cash payments and other non-cash transactions	$ 30	$ 30