Quarterly report pursuant to Section 13 or 15(d)

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

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Preliminary Values Assigned to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Aug. 05, 2015
Dec. 31, 2014
Apr. 17, 2014
Business Acquisition [Line Items]        
Goodwill $ 64,978   $ 42,991  
Value Lighting        
Business Acquisition [Line Items]        
Current assets       $ 16,260
Goodwill       18,635
Intangible assets       19,951
Other assets       2,901
Assets acquired       57,747
Accounts payable and other liabilities       12,613
Deferred income tax liability       5,825
Liabilities assumed       18,438
Purchase price       $ 39,309
Energy Source        
Business Acquisition [Line Items]        
Tangible assets   $ 5,380    
Goodwill   21,987    
Intangible assets   8,355    
Assets acquired   35,722    
Liabilities assumed   3,921    
Purchase price   $ 31,801