Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 52,030
Accumulated Amortization	(11,630)	$ (8,881)
Net Carrying Amount	40,400	$ 34,784
Customer Contracts and back log
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,814
Accumulated Amortization	(4,296)
Net Carrying Amount	518
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,495
Accumulated Amortization	(4,032)
Net Carrying Amount	24,463
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	334
Accumulated Amortization	(121)
Net Carrying Amount	213
Non- compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,113
Accumulated Amortization	(287)
Net Carrying Amount	826
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	268
Accumulated Amortization	(171)
Net Carrying Amount	97
Product certification
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72
Accumulated Amortization	(60)
Net Carrying Amount	12
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,953
Accumulated Amortization	(235)
Net Carrying Amount	1,718
Trademarks / Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,981
Accumulated Amortization	(2,428)
Net Carrying Amount	$ 12,553