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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended
Dec. 31, 2013
Second Amendment
Jan. 31, 2014
Dividend Declared
Jan. 31, 2014
Subsequent Event
Griffith
Customer
Mar. 31, 2014
Subsequent Event
Griffith
Jan. 31, 2014
Subsequent Event
Second Amendment
Subsequent Event [Line Items]          
Distribution declared   $ 0.0825      
Partners capital projected distribution amount on annualized basis   $ 0.33      
Minimum dividend distribution per unit   $ 0.0675      
Percentage of distributions to common unit holders in excess of minimum quarterly distribution   90.00%      
Percentage of distributions to general unit holders in excess of minimum quarterly distribution   10.00%      
Amount to paid to common unit holders   $ 4.7      
Amount to paid to the General Partner   0.1      
Incentive distribution to the General Partner   0.05      
Incentive distributions to Management   0.05      
Dividend payable date   Feb. 07, 2014      
Dividend record date   Jan. 30, 2014      
Maximum borrowing capacity under revolving credit facility 300       300
Maximum borrowing capacity (heating season December to April) under revolving credit facility 450       450
Number of customers     50,000    
Aggregate purchase price partnership acquired       $ 69.9