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Acquisitions - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2017 | May 31, 2015 | Mar. 31, 2015 | Apr. 30, 2014 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 29, 2015 | Apr. 01, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash paid at date of acquisition, net of acquired cash |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 34,227,000 | $ 44,122,000 |  |  |
Contingent consideration |  |  |  |  | $ 12,000 |  |  |  | $ 38,000 |  |  |  |  | 12,000 | 38,000 | 8,717,000 | 0 |  |  | $ 0
Warranty accrual adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 963,000 | 1,600,000 |  |  |
Acquisition consideration, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (712,000) |  |  | 4,379,000 |  |  |
Other expense (income), net |  |  |  |  | (225,000) | $ (9,000) | $ 2,142,000 | $ 453,000 | 146,000 | $ 62,000 | $ 92,000 | $ 59,000 |  | 2,361,000 | 359,000 | 144,000 | (283,000) |  |  |
Deferred income taxes | $ 1,066,000 |  |  |  | 703,000 | 1,210,000 | 1,066,000 | 933,000 | 464,000 | 522,000 | 372,000 | 0 |  | 703,000 | 464,000 | 0 |  |  |  |
Goodwill | 29,835,000 |  |  |  | 29,835,000 | 29,835,000 | 29,835,000 | 29,835,000 | 29,835,000 | 29,835,000 | 29,835,000 | 29,835,000 |  | 29,835,000 | 29,835,000 | 29,835,000 | 23,414,000 |  |  | $ 0
Amortization of intangible assets |  |  |  |  | 1,210,000 | 1,210,000 | 1,209,000 | 1,209,000 | 1,430,000 | 1,429,000 | 1,429,000 | 1,428,000 |  | 4,838,000 | 5,716,000 | 4,582,000 | 1,013,000 |  |  |
Income tax (benefit) provision |  |  |  |  | 320,000 | $ (149,000) | (135,000) | $ (479,000) | $ 1,238,000 | $ 1,792,000 | $ (18,000,000) | 3,357,000 |  | (443,000) | (11,613,000) | 9,702,000 | (7,744,000) |  |  |
Total transaction costs incurred related to acquisition activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 800,000 |  |  |
Increase (decrease) in value reflected in income |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ (230,000) | (23,000) | (3,840,000) |  |  |
Settled Litigation | Carl Trent, Kenneth Trent, and CKT Holdings, Inc. vs. 3PI and PSI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal settlement | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restatement adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  | (26,000) |  |  |  | (85,000) | (466,000) |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | (11,631,000) |  |  |  | (11,631,000) | (132,000) |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  | (1,000) |  |  |  | 0 | 0 |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  | $ (323,000) |  |  |  | 9,314,000 | 3,069,000 |  |  |
Term Loan | Wells Fargo Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000.0 | $ 5,000,000.0 |
Powertrain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  | $ 20,873,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  | (97,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash paid at date of acquisition, net of acquired cash |  | $ 20,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  | $ 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | 28,976,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty accrual adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 years 6 months |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,311,000 |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,600,000 |  |  |  |
Powertrain | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  |  |  |
Powertrain | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bi-Phase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  | 3,619,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  | 266,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash paid at date of acquisition, net of acquired cash |  | 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  | 540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 4,425,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years 6 months |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,217,000 |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 860,000 |  |  |  |
Bi-Phase | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 160,000 |  |  |  |
Bi-Phase | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bi-Phase | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, earn-out period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buck's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  | $ 9,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory step-up |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,526,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buck's | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,380,000 |  |  |  |
3PI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  |  | $ 45,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash paid at date of acquisition, net of acquired cash |  |  |  | 44,122,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |
Fair value of contingent consideration |  |  |  | 3,840,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | 53,022,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years 5 months 8 days |  |  |  |
Inventory step-up |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration (in shares) |  |  |  | 65,772 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition consideration, net of tax |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |
Goodwill |  |  |  | $ 23,414,000 | $ 14,500,000 |  |  |  |  |  |  |  |  | $ 14,500,000 |  |  |  |  |  |
Goodwill expected to be deductible for income tax purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000 |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,300,000 |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Acquisition-related interest expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Increase (decrease) in value reflected in income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |
3PI | Acquisition-related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recurring transaction related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  |  |
3PI | Restatement adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,800,000) |  |  |
3PI | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,400,000 |  |  |
3PI | Tradenames and trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |
3PI | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration (in shares) |  |  |  | 131,544 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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