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Taxation - Components of Income (Loss) Domestic and Foreign (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components of Income (Loss) Domestic and Foreign [Abstract] |  |  |
United States | $ (25,142)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 6,025 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 5,655 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | (661)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 1,840 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | (577)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
(Loss) income before taxes | $ (25,803)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | $ 7,865 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | $ 5,078 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Income before income taxes for 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 23 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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