Property and Equipment - Schedule of Property and Equipment and Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property and Equipment [Line Items]
Property and equipment, gross	$ 364,227	$ 303,100
Less: accumulated depreciation and amortization	(163,865)	(124,950)
Property and equipment, net	275,624	238,458
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	115,754	101,707
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	132,356	99,125
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	65,686	56,879
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	24,278	20,836
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	19,152	18,311
Other [Member]
Property and Equipment [Line Items]
Property and equipment, gross	7,001	6,242
Property and Equipment, net, Excluding Land and Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	200,362	178,150
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	29,034	29,034
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 46,228	$ 31,274