Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Other intangible assets		$ 19,000
Intangible asset amortization expense	2,859,000	266,000	288,000
Patents
Goodwill [Line Items]
Finite lived intangible assets useful lives	12 years
Intangible asset amortization expense	745,000	109,000	123,000
Trademarks
Goodwill [Line Items]
Finite lived intangible assets useful lives	17 years
Intangible asset amortization expense	745,000	109,000	123,000
Customer Relationships
Goodwill [Line Items]
Intangible asset amortization expense	1,248,000	117,000	101,000
Customer Relationships \| Minimum
Goodwill [Line Items]
Finite lived intangible assets useful lives	10 years
Customer Relationships \| Maximum
Goodwill [Line Items]
Finite lived intangible assets useful lives	12 years
Technology
Goodwill [Line Items]
Finite lived intangible assets useful lives	10 years
Intangible asset amortization expense	67,000
Favorable Leases
Goodwill [Line Items]
Finite lived intangible assets useful lives	10 years
Intangible asset amortization expense	3,000
Non-compete agreements
Goodwill [Line Items]
Finite lived intangible assets useful lives	6 years
Intangible asset amortization expense	10,000
Non compete agreements
Goodwill [Line Items]
Intangible asset amortization expense	46,000	41,000	64,000
LED Replacement Lamps and Fixtures
Goodwill [Line Items]
Other intangible assets		996,000
Property and equipment		$ 393,000