Commitments and Contingencies (Details) $ in Millions	3 Months Ended
Sep. 30, 2015 USD ($) item
Commitments under Newbuilding Contracts
Commitments under shipbuilding contracts and supervision agreements \| $	$ 405.5
Number of commitments under shipbuilding contracts and supervision agreements for VLGC newbuildings	8

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

No definition available.

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant