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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | May. 19, 2015 | May. 01, 2015 | Mar. 18, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration liability |  |  |  |  |  |  |  |  | $ 8,900,000
Increased finished goods inventory |  |  |  |  |  |  | $ (589,000) | $ 23,398,000 |
Cost of sales |  |  |  |  | $ 96,700,000 | $ 75,344,000 | 243,637,000 | 198,131,000 |
Operating income (loss) |  |  |  |  | 1,388,000 | 7,519,000 | 9,933,000 | 16,933,000 |
Amortization expense |  |  |  |  | 1,099,000 | 492,000 | 2,755,000 | 492,000 |
Total transaction cost related to acquisition |  |  |  |  | $ 79,000 |  | $ 526,000 |  |
5.50% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 5.50% |  | 5.50% |  |
Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 20,873,000 |  |  | $ 20,776,000 |  |  |  |
Business acquisition, contingent consideration liability |  | 8,200,000 |  |  | 8,200,000 |  | $ 8,200,000 |  |
Provisional aggregate purchase price |  | 28,976,000 |  |  |  |  |  |  |
Working capital adjustment |  |  |  |  | 97,000 |  |  |  |
Change in contingent liability | $ 50,000 |  |  |  |  |  | 50,000 |  |
Increased finished goods inventory |  |  |  |  |  |  | $ 22,000 |  |
Accrued liabilities adjusted amount |  | 1,166,000 |  |  |  |  |  |  |
Powertrain Integration, LLC [Member] | Adjustment [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration liability |  | 8,200,000 |  |  |  |  |  |  |
Provisional aggregate purchase price |  | 28,976,000 |  |  |  |  |  |  |
Working capital adjustment |  | 97,000 |  |  |  |  |  |  |
Accrued liabilities adjusted amount |  | $ 925,000 |  |  |  |  |  |  |
Powertrain Integration, LLC [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 11 years 6 months |  |
Powertrain Integration, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of per annum return on base earn-out payment considered for additional earn-out payment |  | 5.00% |  |  |  |  |  |  |
Powertrain Integration, LLC [Member] | 5.50% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 5.50% |  |  |  |  |  |  |
Bi-Phase Technologies, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  | 5.50% |  |  |  |  |  |
Payment to acquire business |  |  | $ 3,619,000 |  | 3,885,000 |  |  |  |
Business acquisition, contingent consideration liability |  |  | 540,000 |  | 540,000 |  | $ 540,000 |  |
Provisional aggregate purchase price |  |  | 4,425,000 |  |  |  |  |  |
Working capital adjustment |  |  | (266,000) |  | (266,000) |  |  |  |
Increased finished goods inventory |  |  |  |  |  |  | $ 226,000 |  |
Accrued liabilities adjusted amount |  |  | 47,000 |  |  |  |  |  |
Business acquisition agreement date |  |  |  |  |  |  | May 01, 2015 |  |
Initial cash purchase price on acquisition |  |  | $ 3,500,000 |  |  |  |  |  |
Bi-Phase Technologies, LLC [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  | 8 years 6 months |  |
Bi-Phase Technologies, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  |  |  |  | 3 years |  |
Bi-Phase Technologies, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  |  |  |  | 5 years |  |
Bi-Phase Technologies, LLC [Member] | Inventory Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  | 85,000 |  | $ 141,000 |  |
Buck's Acquisition Company, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Increased finished goods inventory |  |  |  |  |  |  | $ 290,000 |  |
Business acquisition agreement date |  |  |  |  |  |  | Mar. 18, 2015 |  |
Initial cash purchase price on acquisition |  |  |  | $ 9,735,000 |  |  |  |  |
Buck's Acquisition Company, LLC [Member] | Inventory Value [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  | 145,000 |  | $ 290,000 |  |
Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration liability |  |  |  |  | 8,150,000 |  | 8,150,000 |  |
Net Intercompany sales |  |  |  |  | 4,824,000 | 6,286,000 | 13,624,000 | 13,558,000 |
Operating income (loss) |  |  |  |  | (3,579,000) | (346,000) | (8,039,000) | (377,000) |
Amortization expense |  |  |  |  | $ 800,000 | $ 748,000 | $ 2,481,000 | 1,303,000 |
Acquisition transaction expenses |  |  |  |  |  |  |  |  | $ 3,474,000
Total transaction cost related to acquisition |  |  |  |  |  |  |  | $ 811,000 |

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