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Rates and Other Regulatory Activities - Additional Information (Detail) - Eastern Shore [Member] $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) dekatherm / d in mi | Dec. 31, 2014 USD ($)
White Oak Lateral Mainline Expansion [Member] |  |
Rates and Other Regulatory Activities [Line Items] |  |
Volume The Expansion Project Is Expected to Provide | dekatherm / d | 45,000 |
Number of Pipeline Miles | mi | 7.2 |
Lateral diamater of pipeline to be installed | in | 16 |
Horsepower Of Additional Compression | 3,550 |
Estimated capital cost | $ 29.8 |
System Reliability Project [Member] |  |
Rates and Other Regulatory Activities [Line Items] |  |
Number of Pipeline Miles | mi | 10.1 |
Lateral diamater of pipeline to be installed | in | 16 |
Estimated capital cost |  | $ 32.1

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- Definition Lateral Diameter Of Pipeline To Be Installed + References No definition available. + Details
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- Definition Volume The Expansion Project Is Expected to Provide + References No definition available. + Details
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- Details
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- Details
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