Property and Equipment - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property and Equipment [Line Items]
Property and equipment, gross	$ 109,160	$ 68,452
Less: accumulated depreciation and amortization	(35,833)	(24,894)
Property and equipment, net	96,848	58,858
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	48,250	28,154
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	23,879	13,959
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	18,987	11,346
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	10,669	8,750
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	6,695	5,464
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	680	358
Vehicles [Member]
Property and Equipment [Line Items]
Property and equipment, gross		421
Excluded Land and Construction in Process [Member]
Property and Equipment [Line Items]
Property and equipment, net	73,327	43,558
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	$ 14,528	$ 6,307