Quarterly report pursuant to Section 13 or 15(d)

Changes in Carrying Amount of Goodwill (Detail)

v2.4.0.8
Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Apr. 17, 2014
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 21,498 $ 17,000
Business acquisition 16,959  
Transfer of Relume's Media business 0  
Goodwill 40,853  
Accumulated impairment losses (2,396)  
Goodwill, Ending Balance 38,457 17,000
Lighting Fixtures and Lamps
   
Goodwill [Line Items]    
Goodwill, Beginning Balance 21,498  
Business acquisition 16,959  
Transfer of Relume's Media business (1,463)  
Goodwill 38,983  
Accumulated impairment losses (1,989)  
Goodwill, Ending Balance 36,994  
Lighting Signage and Media
   
Goodwill [Line Items]    
Goodwill, Beginning Balance 0  
Business acquisition 0  
Transfer of Relume's Media business 1,463  
Goodwill 1,870  
Accumulated impairment losses (407)  
Goodwill, Ending Balance $ 1,463