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Fair Value Measurements - Additional Information (Detail)
 3 Months Ended
Jun. 30, 2015
USD ($)
Contract
Mar. 31, 2015
USD ($)
Contract
Derivatives, Fair Value [Line Items]    
Cash equivalents maturity period, days 90 days  
Number of contracts outstanding | Contract 0 2
Notional value of foreign exchange contract   $ 2,300,000
Change in Gain/(loss) on asset dispositions $ 10,600,000  
Deferred gains on sale/leaseback transactions 5,800,000  
Net gains from the sale of vessels and other assets 1,500,000  
Fast, Crew/Supply Boat    
Derivatives, Fair Value [Line Items]    
Impairment charge on amounts not recoverable 2,400,000  
Stacked Vessels and Other Assets    
Derivatives, Fair Value [Line Items]    
Impairment charge on amounts not recoverable 11,700,000  
Vessels Under Construction    
Derivatives, Fair Value [Line Items]    
Impairment charge on amounts not recoverable 800,000  
Forward Contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 0
Derivative liabilities $ 0 $ 0