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Leases - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Operating and Capital Leases [Line Items]      
Operating Leases, Rent Expense, Sublease Rentals $ 2,000,000    
Equipment Expense $ 1,000,000 $ 1,200,000 $ 1,400,000
Lease Expiration Year 2016    
Number of Operating Lease 41    
Discontinued Operations      
Operating and Capital Leases [Line Items]      
Accrued Rent, Current   $ 4,400,000 $ 1,100,000
Minimum      
Operating and Capital Leases [Line Items]      
Control Centers Leases Range Price $ 1,800    
Control Centers Leases Term 5 years    
Maximum      
Operating and Capital Leases [Line Items]      
Control Centers Leases Range Price $ 5,000    
Control Centers Leases Term 10 years