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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items] |  |  |
Brokered margin loss | $ 5,700,000 |  |
Allowance for doubtful accounts on accounts receivable | 2,494,000 | 2,374,000 |
Bad Debt Expense | 250,000 | 750,000 | 946,000
Liability due to insufficient reserves | 482,000 |  |
Inventory, other | 12,451,000 | 22,315,000 |
Materials and supplies inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory, other | 9,600,000 | 16,300,000 |
Commodity inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory, other | $ 0 | $ 2,600,000 |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The value of gas balancing asset or liability as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e512571-122862 + Details
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