Note 7 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Notional Value of Letters of Credit Performance Bonds and Other Guarantees	$ 1.5	$ 1.2

The total value of a leverage position letters of credit performance bonds and other gaurantees

No definition available.

Name:	glf_NotionalValueOfLettersOfCreditPerformanceBondsAndOtherguarantees
Namespace Prefix:	glf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant