Other Commitments and Contingencies - Additional Information (Detail) gal in Millions		1 Months Ended	12 Months Ended
	Feb. 24, 2016 USD ($)	May. 31, 2013	Dec. 31, 2015 USD ($) dekatherm / d gal	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Other Contingencies And Commitments [Line Items]
Number Of Years To Purchase Propane Under Contract		6 years
Number Of Years Remaining To Purchase Propane Under Contract			3 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			65
Total purchase obligations for 2013			$ 72,300,000
Total purchase obligations for 2014 - 2015			96,800,000
Total purchase obligations for 2016 - 2017			64,400,000
Total purchase obligations thereafter			100,800,000
Maximum authorized liability under such guarantees and letters of credit			50,000,000
Aggregate guaranteed amount			45,600,000
Amount of letter of credit to our current primary insurance company			5,600,000
Unrecognized Tax Benefits			50,000	$ 100,000	$ 300,000
Accruals related to additional sales taxes and gross receipts taxes			$ 310,000	$ 724,000
Purchase Commitment Minimum Volume Per Day | dekatherm / d			9,982
Purchase Commitment Maximum Volume Per Day | dekatherm / d			13,423
Subsequent Event [Member]
Other Contingencies And Commitments [Line Items]
Maximum authorized liability under such guarantees and letters of credit	$ 65,000,000