Recently Issued Accounting Pronouncements - Additional Information (Details)	9 Months Ended
Sep. 30, 2017
Accounting Changes And Error Corrections [Abstract]
Oil sales represent as percentage of total revenue	84.00%
Percentage of oil sales contracts oil revenue identified and reviewed	80.00%
Percentage of gas contracts of gas and NGL sales identified and reviewed	80.00%

Percentage of gas contracts of gas and natural gas liquid sales identified and reviewed.

No definition available.

Name:	lone_PercentageOfGasContractsOfGasAndNaturalGasLiquidSalesIdentifiedAndReviewed
Namespace Prefix:	lone_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration