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Other Commitments and Contingencies - Additional Information (Detail) gal in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) dekatherm / d gal | Dec. 31, 2014 USD ($) dekatherm / d
Other Contingencies And Commitments [Line Items] |  |
Number of years to purchase propane under contract | 6 years |
Annual Estimate Of Volume Of Propane To Be Purchased | gal | 6.5 |
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 |
Document Period End Date | Jun. 30, 2015 |
Maximum authorized liability under such guarantees and letters of credit | $ 50,000,000 |
Aggregate guaranteed amount | 32,000,000 |
Draws on letters of credit | 0 |
Liability for Uncertain Tax Positions, Noncurrent | 100,000 | $ 100,000
Unrecognized Tax Benefits | $ 525,000 | $ 724,000
Purchase Commitment Minimum Volume | dekatherm / d | 9,982 |
Purchase Commitment Maximum Volume | dekatherm / d |  | 13,423
September 12, 2013 [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | $ 1,000,000 |
December 2, 2013 [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | 1,200,000 |
June 1, 2014 [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | 40,000 |
TETLP Letter of Credit [Member] | Texas Eastern Transmission, LP [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | $ 2,300,000 |

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