Restructuring Costs - Summary of Activity of Restructuring Reserves (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]  
Beginning balance $ 41,573
Additions to the reserve, net (532)
Interest accretion 547
Non-cash write-offs (201)
Cash payments and other usage (7,616)
Ending balance 33,771
Severance / Other  
Restructuring Cost And Reserve [Line Items]  
Beginning balance 664
Additions to the reserve, net 2,652
Cash payments and other usage (2,203)
Ending balance 1,113
Facilities  
Restructuring Cost And Reserve [Line Items]  
Beginning balance 40,909
Additions to the reserve, net (3,184)
Interest accretion 547
Non-cash write-offs (201)
Cash payments and other usage (5,413)
Ending balance $ 32,658