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Operating and Direct Financing Leases - Net Investment in Direct Financing Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Direct Financing Leases [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Purchase price of each vessel less upfront prepayment $ 205.0
Upfront prepayment 51.0
Upfront fee 1.0
Minimum scheduled future revenues to be received by company in next 12 months 81.5
Minimum scheduled future revenues to be received by company in second year 83.6
Minimum scheduled future revenues to be received by company in third year 83.9
Minimum scheduled future revenues to be received by company in fourth year 207.9
Minimum scheduled future revenues to be received by company in fifth year $ 173.7
Liquefied Natural Gas [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Number of capital lease assets 2
FSO [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Number of capital lease assets 1
Awilco LNG carriers [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Number of vessels 2
Volume of vessels 155,900
Fixed-rate charter period, extension 1 year
Awilco LNG carriers [Member] | Maximum [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Capital lease arrangement period, lessor five-year fixed rate
Awilco LNG carriers [Member] | Minimum [Member]
  
Property Subject to or Available for Operating Lease [Line Items]  
Capital lease arrangement period, lessor four-year fixed rate