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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets      
Reserve for estimated returns, discounts and allowances $ (32,800) $ (31,300)  
Reserve for uncollectible accounts 24,600 19,400  
Depreciation $ 94,400 90,900 $ 72,700
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 11 years    
Amortization expense $ 33,800 34,500 $ 13,800
Estimated annual amortization expense in year one 29,800    
Estimated annual amortization expense in year two 27,300    
Estimated annual amortization expense in year three 22,900    
Estimated annual amortization expense in year four 18,300    
Estimated annual amortization expense in year five 12,500    
Self-insurance reserve, total 78,400 76,000  
Self-insurance reserve, current 37,759 36,369  
Claims deposits $ 600 600  
Percentage threshold to measure tax benefit 50.00%    
Investment in unconsolidated subsidiary $ 10,900    
Self-insurance      
Finite-Lived Intangible Assets      
Outstanding letters of credit 64,900 59,200  
Aftermarket and refurbished products      
Finite-Lived Intangible Assets      
Inventory 73,400    
Salvage and remanufactured products      
Finite-Lived Intangible Assets      
Inventory $ 6,300    
Salvage Mechanical Products      
Finite-Lived Intangible Assets      
Standard warranty period 6 months    
Remanufactured Engines      
Finite-Lived Intangible Assets      
Standard warranty period 3 years    
Keystone Specialty      
Finite-Lived Intangible Assets      
Inventory   150,696  
Intangible assets recognized   78,110  
Trade names and trademarks      
Finite-Lived Intangible Assets      
Intangible assets recognized $ 3,600 35,500  
Trade names and trademarks | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 4 years    
Trade names and trademarks | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 30 years    
Trade names and trademarks | Keystone Specialty      
Finite-Lived Intangible Assets      
Intangible assets recognized   22,000  
Trade names and trademarks | 2014 Specialty Acquisition of RV Parts Supplier      
Finite-Lived Intangible Assets      
Intangible assets recognized   10,100  
Software and technology related assets      
Finite-Lived Intangible Assets      
Intangible assets recognized $ 1,200 26,700  
Software and technology related assets | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 3 years    
Software and technology related assets | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 6 years    
Software and technology related assets | Keystone Specialty      
Finite-Lived Intangible Assets      
Intangible assets recognized   25,500  
Customer and supplier relationships      
Finite-Lived Intangible Assets      
Intangible assets recognized $ 4,600 65,100  
Customer and supplier relationships | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 4 years    
Customer and supplier relationships | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 20 years    
Customer and supplier relationships | Keystone Specialty      
Finite-Lived Intangible Assets      
Intangible assets recognized   30,500  
Customer and supplier relationships | 2014 Specialty Acquisition of RV Parts Supplier      
Finite-Lived Intangible Assets      
Intangible assets recognized   17,600  
Customer and supplier relationships | Automotive Core      
Finite-Lived Intangible Assets      
Intangible assets recognized   12,000  
Covenants not to compete      
Finite-Lived Intangible Assets      
Intangible assets recognized $ 600 $ 1,900  
Covenants not to compete | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 1 year    
Covenants not to compete | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 5 years    
ACM Parts      
Finite-Lived Intangible Assets      
Investment in unconsolidated subsidiary, ownership percentage 49.00%    
Equity method investment, ownership percentage of other investors 51.00%    
Assets Held-for-sale, Not Part of Disposal Group, Current $ 8,200    
Self Service Segment      
Finite-Lived Intangible Assets      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 0.00%