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Subsequent Events - Additional Information (Detail) (Exmar LGP BVBA [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	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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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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