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Property and Equipment - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and Equipment [Line Items]    
Property and equipment, gross $ 151,791 $ 109,160
Less: accumulated depreciation and amortization (53,525) (35,833)
Property and equipment, net 147,705 96,848
Buildings [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 60,441 48,250
Software and Capitalized Software Costs [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 41,996 23,879
Computer Equipment [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 27,928 18,987
Rental Clocks [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 13,131 10,669
Furniture, Fixtures and Equipment [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 7,528 6,695
Leasehold Improvements [Member]    
Property and Equipment [Line Items]    
Property and equipment, gross 767 680
Excluded Land and Construction in Process [Member]    
Property and Equipment [Line Items]    
Property and equipment, net 98,266 73,327
Land [Member]    
Property and Equipment [Line Items]    
Property and equipment, net 8,993 8,993
Construction in Progress [Member]    
Property and Equipment [Line Items]    
Property and equipment, net $ 40,446 $ 14,528