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Subsequent Events - Additional Information (Detail) (Exmar LGP BVBA [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Vessel Buildings Carriers
Subsequent Event [Line Items] |
Number of LPG carriers | 16
Number of vessels | 25
Number of chartered-in LPG carriers | 5
Partnership own joint venture | 50.00%
Total acquisition amount of joint venture | $ 134.0
Refinancing of joint venture | 355
2014 [Member] |
Subsequent Event [Line Items] |
Number of newbuildings | 4
2015 and 2016 [Member] |
Subsequent Event [Line Items] |
Number of newbuildings | 4
Pro rata share [Member] | Secured Debt [Member] |
Subsequent Event [Line Items] |
Pro rata share of existing debt and lease obligations | $ 108

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