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Acquisition of Professional Power Products Inc - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Wells Fargo Bank, N.A [Member] | Jun. 30, 2014 Minimum [Member] Wells Fargo Bank, N.A [Member] | Jun. 30, 2014 Maximum [Member] Wells Fargo Bank, N.A [Member] | Apr. 01, 2014 Professional Power Products Inc. ("PPPI") [Member] | Jun. 30, 2014 Professional Power Products Inc. ("PPPI") [Member] | Apr. 01, 2014 Professional Power Products Inc. ("PPPI") [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 |  |
Contingent consideration value | 900,000 |  | 900,000 |  |  |  |  | 8,900,000 |  |
Contingent consideration initial purchase price |  |  |  |  |  |  |  | 54,300,000 |  |
Contingent consideration minimum payable value |  |  |  |  |  |  |  |  |  | 5,000,000
Contingent consideration maximum payable value |  |  |  |  |  |  |  |  |  | 15,000,000
Common stock issued to seller, price per share |  |  |  |  |  |  |  |  |  | $ 76.02
Business acquisition agreement date |  |  | Apr. 01, 2014 |  |  |  |  |  |  |
Total transaction cost related to acquisition | 811,000 |  | 811,000 |  |  |  |  |  |  |
Increased line of credit |  |  |  |  |  | 75,000,000 | 90,000,000 |  |  |
Securing term loan |  |  |  |  | 5,000,000 |  |  |  |  |
Increased finished goods inventory |  |  | 18,455,000 | 8,580,000 |  |  |  |  |  |
Net Intercompany sales |  |  |  |  |  |  |  |  | 7,272,000 |
Operating Income Loss | 5,893,000 | 3,840,000 | 9,414,000 | 6,920,000 |  |  |  |  | 31,000 |
Amortization expense |  |  |  |  |  |  |  |  | $ 555,000 |

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