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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands, kr in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
SEK (kr)
Dec. 31, 2017
USD ($)
Dec. 01, 2016
USD ($)
Summary of Significant Accounting Policies [Line Items]          
U.S. federal statutory rate 21.00% 35.00%      
Adoption of ASU 2018-02 (see Note 4) $ 5,345        
Reserve for uncollectible accounts 63,000     $ 58,000  
Depreciation 37,000 $ 27,000      
Amortization expense 24,000 23,000      
Estimated annual amortization expense in year one 75,000        
Estimated annual amortization expense in year two 85,000        
Estimated annual amortization expense in year three 72,000        
Estimated annual amortization expense in year four 60,000        
Estimated annual amortization expense in year five 51,000        
Equity method investments 208,210     208,404  
Equity in earnings of unconsolidated subsidiaries 1,412 214      
Raw Materials [Member]          
Summary of Significant Accounting Policies [Line Items]          
Manufactured Inventory $ 9,000     10,000  
Salvage Mechanical Products          
Summary of Significant Accounting Policies [Line Items]          
Standard warranty period 6 months        
Remanufactured Engines          
Summary of Significant Accounting Policies [Line Items]          
Standard warranty period 3 years        
Trade names and trademarks | Minimum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 4 years        
Trade names and trademarks | Maximum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 30 years        
Software and technology related assets | Minimum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 3 years        
Software and technology related assets | Maximum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 15 years        
Covenants not to compete | Minimum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 2 years        
Covenants not to compete | Maximum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 5 years        
Customer and supplier relationships [Member] | Minimum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 6 years        
Customer and supplier relationships [Member] | Maximum          
Summary of Significant Accounting Policies [Line Items]          
Useful life, years 20 years        
Mekonomen [Member]          
Summary of Significant Accounting Policies [Line Items]          
Investment in unconsolidated subsidiary, ownership percentage 26.50%        
Equity method investments $ 202,000       $ 181,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 125,000        
Equity in earnings of unconsolidated subsidiaries 2,000 $ 300      
Equity Method Investments, Fair Value Disclosure $ 163,000        
Proceeds from Equity Method Investment, Dividends or Distributions     kr 67 $ 7,000