Property and Equipment - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property and Equipment [Line Items]
Property and equipment, gross	$ 259,131	$ 242,319
Less: accumulated depreciation and amortization	(92,247)	(82,969)
Property and equipment, net	187,511	176,962
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	101,541	101,421
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	76,153	66,634
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	45,362	39,492
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	17,788	16,950
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	16,869	16,474
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	1,344	1,274
Vehicles [Member]
Property and Equipment [Line Items]
Property and equipment, gross	74	74
Excluded Land and Construction in Process [Member]
Property and Equipment [Line Items]
Property and equipment, net	166,884	159,350
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	9,023	9,023
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 11,604	$ 8,589