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Operating and Direct Financing Leases - Charters-in - Additional Information (Detail) - In-Chartered [Member]
$ in Millions
Dec. 31, 2016
USD ($)
Property Subject to or Available for Operating Lease [Line Items]  
Total $ 185.0
Minimum commitments to be incurred by the company in current year 105.7
Minimum commitments to be incurred by the company in second year 44.1
Minimum commitments to be incurred by the company in third year 25.5
Minimum commitments to be incurred by the company in fourth year 8.3
Minimum commitments to be incurred by the company in fifth year $ 1.4