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Rate and Regulatory Matters (Details Narrative) (USD $) In Thousands, unless otherwise specified |  |  | 1 Months Ended | 0 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2012 Middlesex | Sep. 30, 2012 Middlesex | Jul. 31, 2012 Middlesex | Mar. 31, 2010 Middlesex | Jun. 30, 2012 Tidewater | Nov. 30, 2012 TESI | Jun. 30, 2012 TESI | Aug. 31, 2012 Pinelands Water | Aug. 31, 2012 Pinelands Wastewater | Jun. 30, 2011 Southern Shores | Mar. 03, 2012 Twin Lakes
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Description of application request seeking increase in base rates |  |  | In November 2012, Middlesex filed a petition with the NJBPU seeking approval of foundational information (Foundational Filing) that would allow for the implementation of a Distribution System Improvement Charge (DSIC). A DSIC is a rate-mechanism that allows water utilities to recover investment in capital improvements to their water distribution system made between base rate proceedings. In February 2013, the Foundational Filing was approved by the NJBPU, which allows Middlesex to implement a DSIC rate in September 2013 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. The maximum annual revenues allowed to be recovered under the approved Foundational Filing is $1.4 million. | Middlesex filed an application with the New Jersey Board of Public Utilities (NJBPU) seeking permission to establish a Purchased Water Adjustment Clause and implement a tariff rate sufficient to recover increased costs of $0.1 million to purchase untreated water from the New Jersey Water Supply Authority and treated water from a non-affiliated regulated water utility. | 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 | In March 2010, the NJBPU granted an increase in Middlesex's annual operating revenues of 13.57%, or $7.8 million. The increase was necessitated by increased costs, as well as to provide a return on invested capital in rate base of $180.3 million based on a return on equity of 10.30%. | 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 | Pinelands Water and Pinelands Wastewater filed applications with the NJBPU seeking permission to increase base rates by approximately $0.2 million and $0.1 million per year, respectively. These requests were made as a result of capital investments Pinelands Water and New Pinelands Wastewater have made, or have committed to make, as well as increased operations and maintenance costs for both companies. | Pinelands Water and Pinelands Wastewater filed applications with the NJBPU seeking permission to increase base rates by approximately $0.2 million and $0.1 million per year, respectively. These requests were made as a result of capital investments Pinelands Water and New Pinelands Wastewater have made, or have committed to make, as well as increased operations and maintenance costs for both companies. |  |
Increase in base rates revenue per year |  |  |  |  | $ 8,100 | $ 7,800 | $ 3,900 |  | $ 600 |  |  |  |
Increase in base rates revenue per year, percent |  |  |  |  |  | 13.57% |  |  |  |  |  |  |
Originally filed base water rate increase |  |  |  | 100 | 11,300 |  | 6,900 | 100 | 800 | 200 | 100 | 100 | 100
Return on invested capital, rate base |  |  |  |  | 202,400 | 180,300 |  |  |  |  |  |  |
Return on equity |  |  |  |  | 10.15% | 10.30% |  |  |  |  |  |  |
Interim rates |  |  |  |  |  |  | 2,500 |  | 100 |  |  |  |
DSIC rate increase |  |  |  |  |  |  |  | 600 |  |  |  |  |
Final base rates |  |  |  |  |  |  | 1,400 |  |  |  |  |  |
Maximum annual revenues allowed under Foundational Filing |  |  | 1,400 |  |  |  |  |  |  |  |  |  |
Regulatory Liability - Cost of Utility Plant Removal | 8,811 | 8,029 |  |  |  |  |  |  |  |  |  |  |
Acquisition premiums | $ 600 |  |  |  |  |  |  |  |  |  |  |  |

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