Supplemental Oil and Gas Disclosures - Additional Information (Details)	12 Months Ended
Dec. 31, 2016
Capitalized Costs Oil And Gas Producing Activities Net [Abstract]
Percentage non-operated non-producing reserves	19.00%
Present value discounted percentage	10.00%

Percentage of non operated proved developed non producing reserves.

No definition available.

Name:	wti_PercentageOfNonOperatedProvedDevelopedNonProducingReserves
Namespace Prefix:	wti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration