Property, Plant and Equipment - Schedule of Property, Plant and Equipment and Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 53,166	$ 33,848
Less: accumulated depreciation	15,517	11,540
Property, plant and equipment, net	46,642	38,671
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	28,154	14,828
Software and Capitalized Software Costs [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	7,635	5,578
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	6,613	4,832
Rental Clocks [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	6,111	4,865
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	4,073	3,189
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	421	421
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	159	135
Excluded Land and Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	37,649	22,308
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	8,993	8,993
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 7,370