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Acquisitions - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
May. 07, 2015
USD ($)
Apr. 01, 2015
USD ($)
mi
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]              
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed         $ (514)    
Revenues     $ 92,682 $ 100,497 262,763 $ 286,834  
Net Income (Loss) Attributable to Parent     6,294 $ 5,134 $ 27,403 $ 22,815 $ 36,092
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         10 years    
Gatherco [Member]              
Business Acquisition [Line Items]              
Number Of Gathering Stations   16          
Number of Pipeline Miles | mi   2,000          
Number of Producers Served   300          
Number of Customers Served   6,000          
Business Combination, Consideration Transferred         $ 57,658    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         592,970    
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   $ 30,200 30,164   $ 30,164    
Payments to Acquire Businesses, Gross   27,500     27,494    
Long-term debt   1,696 1,696   1,696    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 6,800 6,806   6,806    
Business Combination Contingent Cash Consideration Payable     15,000   $ 15,000    
Period Additional Contingent Cash Consideration Will Be Based On         5 years    
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed         $ (1,300)    
Revenues     5,200        
Net Income (Loss) Attributable to Parent     $ (187)        
Propane Distribution [Member]              
Business Acquisition [Line Items]              
Number of Customers Served 253            
Business Combination, Consideration Transferred $ 242            
Finite-lived Intangible Assets Acquired $ 186            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         6 years