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Special Charges - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Employee
Jun. 30, 2017
USD ($)
Employee
Jun. 30, 2016
USD ($)
Special Charges [Line Items]        
Special charges $ 30,074 $ 1,750 $ 30,074 $ 6,811
Total special charges amount payable 37,600   37,600  
Net non-cash expense reversals     7,500  
Number of employees terminated | Employee   19    
Employee Severance and Other Employee Related Costs        
Special Charges [Line Items]        
Special charges     $ 16,100  
Number of employees terminated | Employee     201  
Exit Costs Associated with Curtailment of Lease on Executive Office in Washington, D.C.        
Special Charges [Line Items]        
Special charges     $ 12,400  
Total special charges amount payable $ 20,500   20,500  
Non-cash reduction to expense primarily for reversal of deferred rent liability     8,100  
Other Expenses        
Special Charges [Line Items]        
Special charges     1,600  
Non-cash expense     $ 600