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Fair Value Measurements - Fair Value of Financial Instruments and Other Non-Financial Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of interest rate swap agreements $ 21.7 $ 24.5
Level 2 [Member] | BG Joint Venture [Member] | Shipbuilding supervision and crew training services [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Receivables fair value $ 18.2  
Discount rate 8.00%