Property and Equipment - Schedule of Property and Equipment and Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property and Equipment [Line Items]
Property and equipment, gross	$ 436,599	$ 380,462
Less: accumulated depreciation and amortization	(224,713)	(178,111)
Property and equipment, net	329,296	285,218
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	184,196	144,190
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	116,045	115,772
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	78,710	68,181
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	28,928	25,474
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	21,269	19,829
Other [Member]
Property and Equipment [Line Items]
Property and equipment, gross	7,451	7,016
Property and Equipment, net, Excluding Land and Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	211,886	202,351
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	88,376	53,833
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 29,034	$ 29,034