v2.4.0.8

Summary of Significant Accounting Policies - Additional Information (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Finite-Lived Intangible Assets |  |  |  |  |
Reserve for estimated returns, discounts and allowances | $ 30,500,000 |  | $ 24,700,000 | $ 22,800,000 |
Revenue recognition period for lifetime extended warranties |  |  | 3 years |  |
Shipping and handling revenue |  |  | 25,600,000 | 23,900,000 | 17,300,000
Reserve for uncollectible accounts | 14,100,000 |  | 9,500,000 | 8,300,000 |
Amortization expense | 9,000,000 | 7,100,000 | 9,500,000 | 7,900,000 | 4,200,000
Future Amortization Expense Recognized In Current Fiscal Year | 13,000,000 |  |  |  |
Estimated annual amortization expense, 2013 | 14,200,000 |  | 8,800,000 |  |
Estimated annual amortization expense, 2014 | 12,800,000 |  | 7,900,000 |  |
Estimated annual amortization expense, 2015 | 11,400,000 |  | 7,100,000 |  |
Estimated annual amortization expense, 2016 | 10,500,000 |  | 6,300,000 |  |
Estimated annual amortization expense, 2017 |  |  | 6,000,000 |  |
Self-insurance reserve, total |  |  | 44,100,000 | 37,400,000 |
Self-insurance reserve, current |  |  | 21,500,000 | 18,200,000 |
Claims deposits |  |  | 500,000 | 500,000 |
Percentage threshold to measure tax benefit |  |  | 50.00% |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  |  |
Equity method investment, ownership percentage of other investors | 51.00% |  |  |  |
Equity Method Investments | 9,300,000 |  |  |  |
Self-insurance |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Outstanding letters of credit |  |  | 37,100,000 | 31,800,000 |
Salvage Mechanical Products |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Standard warranty period | 6 months |  | 6 months |  |
Remanufactured Engines |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Standard warranty period | 3 years |  | 3 years |  |
Sator |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized | 49,978,000 |  |  |  |
Euro Car Parts Holdings Limited |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized |  |  |  | 43,723,000 |
Trade names and trademarks |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized |  |  | 600,000 | 40,100,000 |
Trade names and trademarks | Minimum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 10 years |  | 10 years |  |
Trade names and trademarks | Maximum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 30 years |  | 30 years |  |
Trade names and trademarks | Sator |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized | 24,700,000 |  |  |  |
Trade names and trademarks | Euro Car Parts Holdings Limited |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized |  |  |  | 39,300,000 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized |  |  | 4,100,000 | 5,700,000 |
Customer relationships | Minimum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 5 years |  | 5 years |  |
Customer relationships | Maximum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 15 years |  | 10 years |  |
Customer relationships | Sator |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized | 25,300,000 |  |  |  |
Covenants not to compete |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Intangible assets recognized |  |  | $ 600,000 | $ 1,500,000 |
Covenants not to compete | Minimum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 1 year |  | 1 year |  |
Covenants not to compete | Maximum |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Useful life, years | 5 years |  | 5 years |  |

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