Property and Equipment, Net - Schedule of Property and Equipment and Associated Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property and Equipment [Line Items]
Property and equipment, gross	$ 114,610	$ 109,160
Less: accumulated depreciation and amortization	(39,402)	(35,833)
Property and equipment, net	106,485	96,848
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	48,250	48,250
Software and Capitalized Software Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	26,866	23,879
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	20,954	18,987
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	10,963	10,669
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	6,886	6,695
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	691	680
Excluded Land and Construction in Process [Member]
Property and Equipment [Line Items]
Property and equipment, net	75,208	73,327
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	$ 22,284	$ 14,528