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Other Commitments and Contingencies - Additional Information (Detail) $ in Thousands, gal in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) dekatherm / d gal | Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |
Number of years to purchase propane under contract | 6 years |
Remaining contract term | 3 years |
Estimated current annual commitment | gal | 6.5 |
Monthly purchase commitment, minimum | dekatherm / d | 9,982 |
Monthly purchase commitment, maximum | dekatherm / d | 13,423 |
Total liabilities to tangible net worth minimum times | 3.75 |
Fixed charge coverage ratio minimum times | 1.5 |
Time to cure ratio | 30 days |
Funds from operations interest coverage ratio minimum times | 2 |
Total debt to capital maximum | 0.65 |
Maximum authorized liability under such guarantees and letters of credit | $ 65,000 |
Aggregate guaranteed amount | 48,700 |
Draws on letters of credit | 8,100 |
Liability related to unrecognized income tax benefits | 50 | $ 50
Liability related to contingencies for taxes other than income | $ 196 | $ 310

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