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Acquisitions - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
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