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Rate Matters (Details Narratives) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2013
Nov. 30, 2012
Sep. 30, 2013
Mar. 31, 2013
Pinelands
Oct. 01, 2013
Tidewater Environmental Services, Inc
Subsequent Event
N
Apr. 30, 2013
New Jersey Water Supply Authority ( NJWSA)
Public Utilities, General Disclosures [Line Items]            
Storm damage costs (superstorm sandy related costs) $ 400          
Approved amount 200     200    
Purchase cost of untreated water           100
Description of foundational information (Distribution System Improvement Charge )     In February 2013, the Foundational Filing was approved by the NJBPU, which allows Middlesex to implement a DSIC rate to recover costs for qualifying projects that are placed in service in the six-month post-approval period. The DSIC rate is allowed to increase in three subsequent six month periods for any additional qualifying projects placed in service during those time periods.      
Maximum annual revenues allowed under foundational filing for DSIC   1,400        
Expected annual revenue under foundational filing for DSIC   300        
Combined requested annual base revenues       300    
Percentage of approved increase in annual base revenue (in percent)       50.00% 33.50%  
Combined approved annual base revenues period       1 year    
Purchase of wasterwater utility assets         400  
Number of residential customers         600  
Expected annual revenue         $ 200