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Operating and Direct Financing Leases - Charters-in - Additional Information (Detail) - In-Chartered [Member]
$ in Millions
Dec. 31, 2015
USD ($)
Property Subject to or Available for Operating Lease [Line Items]  
Minimum commitments to be incurred by the company $ 185.5
Minimum commitments to be incurred by the company in current year 106.8
Minimum commitments to be incurred by the company in second year 52.1
Minimum commitments to be incurred by the company in third year 8.7
Minimum commitments to be incurred by the company in fourth year 8.3
Minimum commitments to be incurred by the company in fifth year 8.3
Minimum commitments to be incurred by the company thereafter $ 1.3