PROPERTY, PLANT, AND EQUIPMENT, NET (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
PROPERTY, PLANT, AND EQUIPMENT, NET      
Gross $ 1,044,211 $ 715,510  
Less accumulated depreciation (63,870) (33,517)  
Property, plant, and equipment, net 980,341 681,993  
Depreciation expense 30,353 21,337 8,595
Capitalized interest 4,209 2,784 3,362
Gas gathering system
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Useful lives 30 years    
Gross 634,177 427,449  
Compressor stations and compression equipment
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Useful lives 30 years    
Gross 351,560 237,618  
Construction in progress
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Gross 51,023 45,919  
Other
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Gross $ 7,451 $ 4,524  
Other | Minimum
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Useful lives 4 years    
Other | Maximum
     
PROPERTY, PLANT, AND EQUIPMENT, NET      
Useful lives 15 years