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Subsequent Events - Additional Information (Detail) - Subsequent Event $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Apr. 30, 2020 USD ($) $ / shares shares
Motor Fuel and Other Petroleum Products | Impact of COVID-19
Subsequent Event [Line Items]
Percentage of decrease in sales volume	35.00%
Service Revenues | Impact of COVID-19
Subsequent Event [Line Items]
Percentage of decrease in sales revenue	10.00%
Installation Revenues | Impact of COVID-19
Subsequent Event [Line Items]
Percentage of decrease in sales revenue	40.00%
Plan III Common Units Repurchase Program
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares	0.4
Average price paid per unit | $ / shares	$ 7.71
Dividend Declared
Subsequent Event [Line Items]
Distribution declared | $ / shares	0.1325
Partners capital projected distribution amount on annualized basis | $ / shares	0.53
Minimum dividend distribution per unit | $ / shares	$ 0.0675
Amount to paid to common unit holders | $	$ 6.0
Amount to paid to the General Partner | $	0.2
Incentive distribution to the General Partner | $	0.2
Incentive distributions to management | $	$ 0.2
Dividend payable date	May 12, 2020
Dividend record date	May 04, 2020

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