2.2.0.25falsefalse0409 - Disclosure - Operating Segment Information (Policies)truefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011
USD ($)
USD ($) / shares
$Jan-01-2011_Mar-31-2011http://www.sec.gov/CIK0001030749duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0glf_OperatingSegmentInformationPoliciesAbstractglffalsenadurationOperating Segment Information.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringOperating Segment Information.falsefalse3false0glf_SegmentReportingPolicyTextBlockglffalsenadurationSegment Reporting.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Accounting Policy: GLF-20110331_note9_accounting_policy_table1 - glf:SegmentReportingPolicyTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="left" style="font-size: 10pt; margin-top: 6pt">     We operate three segments: the North Sea, Southeast Asia and the Americas, each
of which is
considered a reportable segment under FASB ASC 280, <i>“Segment Reporting”</i>. Our management evaluates
segment performance primarily based on operating income. Cash and debt are managed centrally.
Because the regions do not manage those items, the gains and losses on foreign currency
remeasurements associated with these items are excluded from operating income. Our management
considers segment operating income to be a good indicator of each segment’s operating performance
from its continuing operations, as it represents the results of the ownership interest in
operations without regard to financing methods or capital structures. Each operating segment’s
operating income (loss) is summarized in the following table, and detailed discussions below.
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block TaggedfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringSegment Reporting.No authoritative reference available.falsefalse12Operating Segment Information (Policies)UnKnownUnKnownUnKnownUnKnownfalsetrue