Stock Repurchase Authority (Details) - USD ($) $ in Millions	Jun. 30, 2023	Feb. 02, 2022
Stock repurchases
Common stock repurchase authorized amount		$ 100.0
Share repurchase authority, treasury stock acquired (shares)	50,000
Share repurchase authority, treasury stock acquired (value)	$ 0.7

Equity impact of the cost of common and preferred stock that were repurchased to date. Recorded using the cost method.

No definition available.

Name:	lpg_TreasuryStockValueAcquiredCostMethodToDate
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant