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Other Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011
Other Contingencies And Commitments [Line Items] |  |
Current expiration date of agreement | 2020 |
Term of franchise agreement | 10 years |
Total litigation expense | $ 1,400,000 |
Total liabilities to tangible net worth minimum times | 3.75 |
Fixed charge coverage ratio minimum times | 1.5 |
Time to cure ratio | 30 days |
Funds from operations interest coverage ratio minimum times | 2 |
Total debt to capital maximum | 65 |
Total purchase obligations for 2013 | 69,500,000 |
Total purchase obligations for 2014 - 2015 | 99,300,000 |
Total purchase obligations for 2016 - 2017 | 82,000,000 |
Total purchase obligations thereafter | 180,200,000 |
Maximum authorized liability under such guarantees and letters of credit | 45,000,000 |
Aggregate guaranteed amount | 29,700,000 |
Amount of letter of credit to our current primary insurance company | 304,000 |
Guarantees expiring date | June 1,2013 |
Accruals related to additional sales taxes and gross receipts taxes | 82,000 | 307,000
Delaware division [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Volume subscribed | 30,000 |
Maximum daily volume subscribed | 34,100 |
Maryland division [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Volume subscribed | 10,000 |
Maximum daily volume subscribed | 15,900 |
TETLP [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | 2,300,000 |
Expected TETLP's mainline system expansion | 190,000 |
Number of transportation service contract | 2 |
Letter of credit two [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | 656,000 |
Issued letter of credit expiry date | Dec. 02, 2013 |
Letter of credit one [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Amount of letter of credit to our current primary insurance company | $ 1,000,000 |

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