Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended				0 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Apr. 17, 2014	Dec. 31, 2013	Nov. 15, 2013 Tri-State DE LLC	Sep. 30, 2014 Tri-State DE LLC	Nov. 15, 2013 Tri-State DE LLC	Nov. 15, 2013 Tri-State DE LLC Common Stock	Dec. 31, 2013 Relume Technologies Inc	Dec. 31, 2013 Relume Technologies Inc Change of Control	Dec. 31, 2013 Elite LED Solutions Incorporated	Apr. 17, 2014 Value Lighting Installment	Sep. 30, 2014 Value Lighting	Dec. 31, 2013 Value Lighting	Apr. 17, 2014 Value Lighting
Business Acquisition [Line Items]
Business acquisition cash Consideration					$ 1,800,000							$ 10,600,000
Business acquisition aggregate purchase consideration												39,100,000
Business acquisition, number of shares issued								543,052				8,468,192
Business acquisition, number of Installments												4
Business acquisition, common stock issuable installment value												20,900,000
Business acquisition, contingent consideration payable in cash or common stock, maximum															11,000,000
Business acquisition, contingent consideration							900,000								7,800,000
Business acquisition, preliminarily reduced purchase price												200,000
Estimated fair value of intangible assets			19,800,000
Goodwill	39,335,000		17,800,000	21,498,000			2,786,000								17,837,000
Carrying amount of debt encumbering with property			2,400,000
Business acquisition, liability incurred					1,500,000
Business acquisition, liability incurred repayment term					6 months
Business acquisition, interest rate on liability incurred					5.00%
Business acquisition, value of equity issued								1,600,000
Contingent obligation, number of additional shares to issue								365,628
Business acquisition, working capital adjustment						25,000
Business acquisition, charges	500,000								400,000	700,000
Amortization of intangible assets related to acquired backlog	3,517,000	2,444,000												2,300,000
Gain on bargain purchase of business		743,000									700,000
Loss on extinguishment of debt									4,200,000
Gain on deconsolidation of subsidiary that filed a bankruptcy petition									1,500,000
Revenue from the date of acquisition													16,466,000
Net income from the date of acquisition													$ 1,485,000