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Supplemental Information On Oil And Gas Producing Activities (Results Of Operations For Oil And Gas Producing Activities) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | [1] | Sep. 30, 2015 | [1] | Jun. 30, 2015 | [1] | Mar. 31, 2015 | [1] | Dec. 31, 2014 | [1] | Sep. 30, 2014 | [1] | Jun. 30, 2014 | [1] | Mar. 31, 2014 | [1] | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and natural gas sales |  | $ 17,523 | $ 17,546 | $ 27,137 | $ 18,239 | $ 23,037 | $ 24,486 | $ 52,098 | $ 28,071 | $ 80,445 | $ 127,691 | $ 169,277
International [Member] |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and natural gas sales |  |  |  |  |  |  |  |  |  | 79,947 | 126,322 | 167,386
Production and other expense | [2] |  |  |  |  |  |  |  |  | (51,959) | (34,503) | (38,783)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | (32,137) | (19,079) | (15,302)
Exploration expenses |  |  |  |  |  |  |  |  |  | (45,203) | (15,358) | (12,431)
Impairment of proved properties |  |  |  |  |  |  |  |  |  | (78,080) | (98,341) |
Bad debt expense |  |  |  |  |  |  |  |  |  | (2,700) | (2,400) | (1,562)
Income tax |  |  |  |  |  |  |  |  |  | (13,238) | (22,486) | (34,115)
Results from oil and natural gas producing activities |  |  |  |  |  |  |  |  |  | (143,370) | (65,845) | 65,193
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and natural gas sales |  |  |  |  |  |  |  |  |  | 498 | 1,369 | 1,891
Production and other expense | [2] |  |  |  |  |  |  |  |  | (171) | (467) | (735)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | (633) | (901) | (1,528)
Exploration expenses |  |  |  |  |  |  |  |  |  | (1,250) |  | (11,497)
Impairment of proved properties |  |  |  |  |  |  |  |  |  | (3,242) |  |
Income tax |  |  |  |  |  |  |  |  |  | (1,349) |  |
Results from oil and natural gas producing activities |  |  |  |  |  |  |  |  |  | $ (6,147) | $ 1 | $ (11,869)
[1] | As discussed in Note 3 to the consolidated financial statements an error was identified the prepaid royalty account that caused previous periods to be misstated. Total revenues were corrected through an out of period adjustment in the fourth quarter of 2015 with reduction of $2.3 million, overstating operating loss and net loss by $2.3 million.
[2] | Excludes corporate costs, general and administrative expenses and allocated corporate overhead.

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