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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
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May. 19, 2015 | May. 01, 2015 | Mar. 18, 2015 | Apr. 01, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased finished goods - inventory |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,336,000 | $ 34,125,000 | $ 16,667,000
Accrued liabilities adjusted amount |  |  |  | $ 4,311,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition net of cash paid |  |  |  |  |  |  |  |  |  |  |  |  | 34,396,000 | 44,122,000 |
Business acquisition cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,277,000 |
Earn-out consideration value |  |  |  |  |  |  |  |  |  |  |  |  | 8,740,000 |  |
Common stock.shares representing fixed portion of consideration |  |  |  |  |  |  |  |  | 65,772 |  |  |  |  | 65,772 |
Common stock value |  |  |  |  |  |  |  |  | $ 5,060,000 |  |  |  |  | $ 5,060,000 |
Initial value of earn out portion of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,840,000 |
Accounts receivable gross |  |  |  |  |  |  |  |  | 4,332,000 |  |  |  |  | 4,332,000 |
Accounts receivable expected to be uncollectible |  |  |  |  |  |  |  |  | 343,000 |  |  |  |  | 343,000 |
Acquisition transaction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Change in the fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,840,000 |
Deferred income tax liabilities |  |  |  |  | $ 4,848,000 |  |  |  | 3,640,000 |  |  |  | 4,848,000 | 3,640,000 |
Income tax expense |  |  |  |  | (2,591,000) | $ (466,000) | $ 1,285,000 | $ 1,384,000 | 3,309,000 | $ 3,996,000 | $ 2,250,000 | $ 1,258,000 | (388,000) | 10,813,000 | 4,759,000
Tax effect adjustments in additional paid-in-capital |  |  |  |  |  |  |  |  |  |  |  |  |  | (681,000) |
Operating Income Loss |  |  |  |  | $ 738,000 | $ (1,388,000) | $ (4,475,000) | $ (4,070,000) | (9,111,000) | $ (7,519,000) | $ (5,893,000) | $ (3,521,000) | (9,195,000) | (26,044,000) | (14,967,000)
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,582,000 | 1,013,000 |
Total transaction cost related to acquisition |  |  |  |  |  |  |  |  |  |  |  |  | $ 526,000 |  |
5.50% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 5.50% |  |  |  |  |  |  |  | 5.50% |  |
Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration liability |  |  |  |  |  |  |  |  | 0 |  |  |  |  | $ 0 |
Contingent Consideration Classified as Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration, common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 131,544 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect adjustments in additional paid-in-capital |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (681,000) |
Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration initial purchase price | $ 20,873,000 |  |  |  |  |  |  |  |  |  |  |  | $ 20,776,000 |  |
Business acquisition, contingent consideration liability | 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional aggregate purchase price | 28,976,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 97,000 |  |
Increased finished goods - inventory |  |  |  |  |  |  |  |  |  |  |  |  | 22,000 |  |
Accrued liabilities adjusted amount | $ 832,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration initial purchase price |  | $ 3,619,000 |  |  |  |  |  |  |  |  |  |  | 3,885,000 |  |
Business acquisition, contingent consideration liability |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration initial purchase price |  |  |  | 54,300,000 |  |  |  |  |  |  |  |  |  |  |
Increased finished goods - inventory |  |  |  |  |  |  |  |  |  |  |  |  |  | 482,000 |
Business acquisition net of cash paid |  |  |  | 45,400,000 |  |  |  |  |  |  |  |  | $ 44,122,000 |  |
Business acquisition cash acquired |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  | 1,277,000 |  |
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 value |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition transaction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,474,000 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  | 1,570,000 |  |  |  |  | 1,570,000 | $ 681,000
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,570,000 |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  | 18,000,000 |
Net Intercompany sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,400,000 |
Operating Income Loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,108,000 |
Total transaction cost related to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 811,000 |
Professional Power Products, Inc. [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect adjustments in additional paid-in-capital |  |  |  |  |  |  |  |  |  |  |  |  |  | 681,000 |
Wells Fargo Bank, N.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Securing term loan |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total transaction cost related to acquisition |  |  |  |  |  |  |  |  | $ 811,000 |  |  |  |  | 811,000 |
Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities adjusted amount |  |  |  | 1,054,000 |  |  |  |  |  |  |  |  |  |  |
Reversal of liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,840,000 |
Adjustment [Member] | Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration liability | $ 8,200,000 |  |  |  | $ 8,248,000 |  |  |  |  |  |  |  | $ 8,248,000 |  |
Provisional aggregate purchase price | 28,976,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment | 97,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities adjusted amount | $ 591,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment [Member] | Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased finished goods - inventory |  |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities adjusted amount |  |  |  | $ 1,054,000 |  |  |  |  |  |  |  |  |  |  |
Weighted Average [Member] | Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  | 11 years 6 months |  |
Weighted Average [Member] | Bi-Phase Technologies, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  | 8 years 6 months |  |
Minimum [Member] | Contingent Consideration Classified as Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration, common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,772 |
Minimum [Member] | Powertrain Integration, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of per annum return on base earn-out payment considered for additional earn-out payment | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Bi-Phase Technologies, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration, common stock shares |  |  |  | 65,772 |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Contingent Consideration Classified as Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration, common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,316 |
Maximum [Member] | Bi-Phase Technologies, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Professional Power Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration, common stock shares |  |  |  | 197,316 |  |  |  |  |  |  |  |  |  |  |

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- Definition Business acquisition contingent consideration. + References No definition available. + Details
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- Definition Business acquisitions contingent consideration shares issuable. + References No definition available. + Details
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- Definition Business Combination Contingent Consideration Earn Out Period + References No definition available. + Details
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- Definition Business combination net working capital adjustments. + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Change In Fair Value Of Contingent Consideration + References No definition available. + Details
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- Definition The nonrecurring preacquisiton transaction expenses excluded from proforma information. + References No definition available. + Details
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- Definition Return on base earn-out payment percentage. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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