Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 60,601
Accumulated Amortization	15,198	$ 12,849
Net Carrying Amount	45,403	$ 39,595
Customer Contracts and back log
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,026
Accumulated Amortization	4,704
Net Carrying Amount	322
Customer relationships and product supply agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34,098
Accumulated Amortization	6,497
Net Carrying Amount	27,601
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	334
Accumulated Amortization	179
Net Carrying Amount	155
Non- compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,386
Accumulated Amortization	517
Net Carrying Amount	869
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	268
Accumulated Amortization	189
Net Carrying Amount	79
Product certification
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10
Accumulated Amortization	3
Net Carrying Amount	7
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,953
Accumulated Amortization	486
Net Carrying Amount	1,467
Trademarks / Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,526
Accumulated Amortization	2,623
Net Carrying Amount	$ 14,903