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Restructuring - Additional Information (Detail) - February 2015 Restructuring Plan
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 17, 2015
Employee
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
Employee
Restructuring Cost and Reserve [Line Items]        
Reduction of market leader head count | Employee 350     80
Restructuring charge   $ 3.4 $ 35.1  
Restructuring reserves   0.2 0.2  
Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge     7.7  
Contract Termination Costs | Bellevue, Washington        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge   2.2    
Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge     12.1  
Noncash Expenses Relating to Employee Benefit        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge   $ 1.1 15.1  
Leasehold improvements | Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs for contract termination costs     $ 4.0