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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% |  |

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