Property and Equipment, Net - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property and Equipment [Line Items]
Property and equipment, gross	$ 220,843	$ 151,791
Less: accumulated depreciation and amortization	(66,200)	(53,525)
Property and equipment, net	165,370	147,705
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	101,109	60,441
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	54,339	41,996
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	34,176	27,928
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	14,532	13,131
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	15,544	7,528
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	1,093	767
Vehicles [Member]
Property and Equipment [Line Items]
Property and equipment, gross	50
Excluded Land and Construction in Process [Member]
Property and Equipment [Line Items]
Property and equipment, net	154,643	98,266
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	9,023	8,993
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 1,704	$ 40,446