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
Jun. 30, 2015
Dec. 31, 2014
Apr. 17, 2014
Business Acquisition [Line Items]      
Goodwill $ 42,991 $ 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