Acquisition of Professional Power Products Inc - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended				0 Months Ended		0 Months Ended			0 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 01, 2014	Apr. 01, 2014 Professional Power Products Inc ("PPPI") [Member]	Sep. 30, 2014 Professional Power Products Inc ("PPPI") [Member]	Sep. 30, 2014 Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Wells Fargo Bank, N.A [Member]	Apr. 01, 2014 Measurement Period Adjustment [Member]	Apr. 01, 2014 Measurement Period Adjustment [Member] Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Measurement Period Adjustment [Member] Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Minimum [Member] Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Minimum [Member] Wells Fargo Bank, N.A [Member]	Jun. 28, 2013 Minimum [Member] Wells Fargo Bank, N.A [Member]	Apr. 01, 2014 Maximum [Member] Professional Power Products Inc ("PPPI") [Member]	Apr. 01, 2014 Maximum [Member] Wells Fargo Bank, N.A [Member]	Jun. 28, 2013 Maximum [Member] Wells Fargo Bank, N.A [Member]
Loans At Acquisition Date [Line Items]
Business acquisition net of cash paid				$ 44,122,000			$ 45,400,000
Business acquisition cash acquired							1,300,000
Business acquisition agreement date				Apr. 01, 2014
Earn-out consideration minimum payable value										5,000,000
Earn-out consideration maximum payable value										15,000,000
Common stock issued, price per share										$ 76.02
Earn-out consideration, common stock shares							131,544								65,772			197,316
Earn-out consideration value							8,900,000
Earn-out consideration initial purchase price							54,300,000
Earn-out consideration liability										8,900,000
Earn-out consideration classified as equity								5,100,000	5,100,000
Total transaction cost related to acquisition	811,000			811,000
Line of credit	100,000,000			100,000,000		90,000,000										75,000,000	75,000,000		90,000,000	100,000,000
Securing term loan											5,000,000
Increased finished goods - inventory		482,000		23,398,000	10,376,000								120,000
Accrued libilities adjusted amount						4,102,000						845,000		845,000
Net Intercompany sales								6,286,000	13,558,000
Operating Income Loss	7,519,000		4,122,000	16,933,000	11,042,000			346,000	377,000
Amortization expense								$ 748,000	$ 1,303,000