Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 52,444
Accumulated Amortization	(13,921)	$ (12,849)
Net Carrying Amount	38,523	$ 39,595
Customer Contracts and back log
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,822
Accumulated Amortization	(4,575)
Net Carrying Amount	247
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,901
Accumulated Amortization	(5,733)
Net Carrying Amount	23,168
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	334
Accumulated Amortization	(160)
Net Carrying Amount	174
Non- compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,113
Accumulated Amortization	(438)
Net Carrying Amount	675
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	268
Accumulated Amortization	(182)
Net Carrying Amount	86
Product certification
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72
Accumulated Amortization	(64)
Net Carrying Amount	8
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,953
Accumulated Amortization	(439)
Net Carrying Amount	1,514
Trademarks / Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,981
Accumulated Amortization	(2,330)
Net Carrying Amount	$ 12,651