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Leases - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Capital Leased Assets [Line Items]      
Depreciation on capital leases $ 4.2 $ 3.0 $ 3.4
Net deferred rent 2.0 0.1 0.3
Rental expense for all operating leases $ 1.7 2.0 1.4
Lease expiration date Jul. 31, 2022    
Lease renewal option 5 years    
Capital Lease Obligations [Member]      
Capital Leased Assets [Line Items]      
Depreciation on capital leases $ 2.2 1.7 $ 2.2
Capital Lease Obligations [Member] | Computer Equipment and Leasehold Improvements [Member]      
Capital Leased Assets [Line Items]      
Assets purchased, financed by a capital lease $ 2.7 $ 1.7  
Capital Lease Obligations [Member] | Capital Lease One [Member]      
Capital Leased Assets [Line Items]      
Capital lease terms 24 Months    
Capital Lease Obligations [Member] | Capital Lease Two [Member]      
Capital Leased Assets [Line Items]      
Capital lease terms 30 Months    
Capital Lease Obligations [Member] | Capital Lease Three [Member]      
Capital Leased Assets [Line Items]      
Capital lease terms 36 Months