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Partners' Capital - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 4 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition        
Equity offering 14,555,000      
Net price per common unit $ 9.53      
Net proceeds from equity offering $ 133,327      
Issuance of partnership's units   $ 132,588    
$370,000 Credit Facility        
Business Acquisition        
Line of credit facility, maximum borrowing capacity 370,000      
$350,000 Credit Facility        
Business Acquisition        
Line of credit facility, maximum borrowing capacity 350,000      
$25,000 Credit Facility        
Business Acquisition        
Line of credit facility, maximum borrowing capacity $ 25,000      
Class B Convertible Preferred Units        
Business Acquisition        
Number of Class B convertible preferred units converted to common units   1,240,404 350,000  
Underwriters Exercise of Overallotment Options        
Business Acquisition        
Equity offering 1,755,000      
CMTC        
Business Acquisition        
Units purchased 1,100,000      
Common Units converted to General Partner Units   315,908   0
Interest of CGP in the partnership   2.00%   2.00%