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Reconciliation of Beginning and Ending Balances for Assets (Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level Three) (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Contingent Consideration
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||||||
| Beginning balance | $ 0 | $ (313) | $ (9,325) | |||||||||
| Included in earnings (a) | (198) | [1] | 839 | [1] | ||||||||
| Included in other comprehensive income | 0 | 0 | ||||||||||
| Purchases, issuances and settlements | (991) | (991) | ||||||||||
| Transfers (in)/out of Level 3 | 511 | 8,486 | ||||||||||
| Ending balance | 0 | (991) | 0 | (991) | ||||||||
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Fuel price derivatives - diesel
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||||||
| Beginning balance | 498 | 3,398 | (107) | (25) | ||||||||
| Included in earnings (a) | (1,015) | [2] | (3,812) | [2] | (410) | [1] | (389) | [1] | ||||
| Included in other comprehensive income | 0 | 0 | 0 | 0 | ||||||||
| Ending balance | $ (517) | $ (414) | $ (517) | $ (414) | ||||||||
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