Property and Equipment, Net - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property and Equipment [Line Items]
Property and equipment, gross	$ 133,429	$ 109,160
Less: accumulated depreciation and amortization	(43,706)	(35,833)
Property and equipment, net	116,957	96,848
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	60,095	48,250
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	30,771	23,879
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	23,073	18,987
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	11,723	10,669
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	7,052	6,695
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	715	680
Excluded Land and Construction in Process [Member]
Property and Equipment [Line Items]
Property and equipment, net	89,723	73,327
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	18,241	14,528
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 8,993	$ 8,993