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Supplemental Information on Oil and Gas Producing Activities (Capitalized Costs Relating to Oil and Gas Producing Activities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Capitalized Costs Relating to Oil and Gas Producing Activities: |  |  |
Properties not being amortized |  | $ 10,000 | $ 47,290
Properties being amortized | [1] | 423,541 | 347,186
Total capitalized costs |  | 433,541 | 394,476
Less accumulated depreciation, depletion, and amortization |  | (400,168) | (289,272)
Net capitalized costs |  | 33,373 | 105,204
Asset retirement cost |  | $ 8,700 | $ 5,200
[1] | Includes $8.7 million and $5.2 million asset retirement cost in 2015 and 2014.

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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 + Details
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- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 + Details
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- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 + Details
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