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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | May. 19, 2015 | May. 01, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Private placement warrant income |  | $ 8,750,000 | $ 858,000 | $ 8,040,000 | $ 1,190,000 |  |  |
Contingent consideration liability |  |  |  |  |  |  |  | $ 8,900,000
Change in the fair value of contingent consideration |  |  | $ 3,208,000 | $ 50,000 | $ 3,782,000 |  |  |
Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent liability description |  |  |  | a ten percentage point change in the volatility factor would result in an immaterial increase or decrease in the fair value of the contingent consideration. |  |  |  |
Decrease in volatility factor |  |  |  | 10.00% |  |  |  |
Contingent consideration liability |  | 8,150,000 |  | $ 8,150,000 |  |  |  |
Bi-Phase Technologies, LLC [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration liability |  | 540,000 |  | $ 540,000 |  |  | $ 540,000 |
Bi-Phase Technologies, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  | 3 years |  |  |  |
Bi-Phase Technologies, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  | 5 years |  |  |  |
Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration liability |  | 8,200,000 |  | $ 8,200,000 |  | $ 8,200,000 |  |
Change in contingent liability | $ 50,000 |  |  | 50,000 |  |  |  |
Change in the fair value of contingent consideration |  | $ 50,000 |  | $ 50,000 |  |  |  |
Private Placement Warrants [Member] | Black-Scholes [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Estimated price volatility percentage |  | 10.00% |  | 10.00% |  |  |  |

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