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Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Weighted-average amortization period of intangible assets consisted of time-charter contracts 17 years 1 month 6 days 17 years 1 month 6 days  
Amortization expense of intangible assets $ 8,900,000 $ 9,200,000 $ 13,100,000
Amortization expense of intangible assets, 2016 8,900,000    
Amortization expense of intangible assets, 2017 8,900,000    
Amortization expense of intangible assets, 2018 8,900,000    
Amortization expense of intangible assets, 2019 8,900,000    
Amortization expense of intangible assets, 2020 8,900,000    
Carrying amount of goodwill 35,631,000 35,631,000  
Goodwill impairment $ 0 $ 0