| **Commitments and Contingencies - Additional Information (Details) (USD $)**         | 9 Months Ended |             |
|--------------------------------------------------------------------------------------|----------------|-------------|
||
| **Commitments and Contingencies Disclosure [Line Items]**                            |           |        |
| Threshold of ownership percentage in Company for private investigation of compliance | 5.00%          |        |
| Environmental liabilities                                                            | $ 1,515,000    | $ 1,621,000 |
| Supply commitment (in tons)                                                          | 3,900,000      |        |
| Surety bonds | Certain development projects                                          |           |        |
| **Commitments and Contingencies Disclosure [Line Items]**                            |           |        |
| Commitment obligations                                                               | 14,800,000     | 10,300,000  |
| Surety bonds | Standby letters of credit                                             |           |        |
| **Commitments and Contingencies Disclosure [Line Items]**                            |           |        |
| Commitment obligations                                                               | $ 800,000      | $ 1,100,000 |

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| - Definition
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs accrued as of the balance sheet date for environmental loss contingencies.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.
+ References
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