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Real Estate Charges (Tables)
 3 Months Ended
Mar. 31, 2017
Restructuring and Related Activities [Abstract]  
Real Estate Liability Account Activity Related to Office Space Consolidation Initiatives
 
Three Months Ended
March 31, 2017
 
Twelve Months Ended
December 31, 2016
 
(in thousands)
 
 
 
 
Balance as of beginning of period
$
112,932

 
$
123,912

Expense (credit) incurred
(2
)
 
12,248

Deferred rent
—

 
4,930

Payments made
(7,318
)
 
(32,988
)
Interest accretion
1,045

 
4,830

Balance as of end of period
$
106,657

 
$
112,932