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Rate Matters (Details Narrative) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Jul. 31, 2012
Middlesex
Jun. 30, 2012
Tidewater
Jun. 30, 2012
TESI
Regulatory Liabilities [Line Items]      
Description of application request seeking increase in base rates Middlesex filed an application with the New Jersey Board of Public Utilities (NJBPU) seeking permission to increase its base rates by approximately $11.3 million per year Tidewater filed an application with the Delaware Public Service Commission (DEPSC) seeking permission to increase its base rates by approximately $6.9 million per year TESI filed an application with the DEPSC seeking permission to increase its base rates by approximately $0.8 million per year
Increase in base rates revenue per year $ 8,100 $ 3,900 $ 600
Originally filed base water rate increase 11,300 6,900 800
Return on invested capital, rate base 202,400    
Return on equity 10.15%    
Interim rates   2,500 100
Final base rates   $ 1,400