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Stock-based Compensation Plans - PSUA Activities (Parenthetical) (Detail) - shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Oklahoma, Virginia And West Virginia |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares vested in period on performance number of units | 19,684 |
Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Actual payout of shares on performance units granted | 0.00% | 0.00%
Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Actual payout of shares on performance units granted | 150.00% | 150.00%

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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