Other Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2013	Dec. 31, 2014 gal	Dec. 31, 2013
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		6,500,000
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		$ 78,600,000
Total purchase obligations for 2014 - 2015		98,700,000
Total purchase obligations for 2016 - 2017		87,100,000
Total purchase obligations thereafter		121,000,000
Maximum authorized liability under such guarantees and letters of credit		50,000,000
Aggregate guaranteed amount		31,600,000
Amount of letter of credit to our current primary insurance company		40,000
Unrecognized Tax Benefits		100,000	300,000
Guarantees expiring date		12/30/2015
Accruals related to additional sales taxes and gross receipts taxes		700,000	1,000,000
TETLP
Other Contingencies And Commitments [Line Items]
Amount of letter of credit to our current primary insurance company		2,300,000
Letter of credit two
Other Contingencies And Commitments [Line Items]
Amount of letter of credit to our current primary insurance company		1,100,000
Issued letter of credit expiry date		Oct. 31, 2015
Letter of credit one
Other Contingencies And Commitments [Line Items]
Amount of letter of credit to our current primary insurance company		$ 1,000,000
Issued letter of credit expiry date		Sep. 12, 2015