Quarterly report pursuant to Section 13 or 15(d)

Preliminary Values Assigned to Assets Acquired and Liabilities Assumed (Detail)

v3.4.0.3
Preliminary Values Assigned to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Aug. 05, 2015
Business Acquisition [Line Items]      
Goodwill $ 64,267 $ 64,267  
Energy Source      
Business Acquisition [Line Items]      
Tangible assets     $ 5,379
Goodwill     21,276
Intangible Assets     8,768
Assets acquired     35,423
Liabilities assumed     3,921
Purchase price     $ 31,502