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Asset Impairments - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Vessel
Dec. 31, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Vessel
Mar. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]          
Asset impairments [1] $ 253,422 $ 15,141 $ 419,870 $ 61,771  
Number of vessels impaired during the period | Vessel 74 14 115 47  
Fair value of assets incurring impairment $ 523,495 $ 90,010 $ 813,851 $ 244,310  
Net book value of assets 3,009,407   3,009,407   $ 3,551,291
Total carrying value of vessels 4,204,048   $ 4,204,048   $ 4,666,749
Stacked Vessels and Other Assets          
Derivatives, Fair Value [Line Items]          
Asset impairments $ 84,100        
Number of vessels impaired during the period | Vessel 26        
Fair value of assets incurring impairment $ 219,900        
Number of vessels stacked | Vessel 80   80    
Net book value of assets $ 752,300   $ 752,300    
Active Vessels          
Derivatives, Fair Value [Line Items]          
Asset impairments $ 169,300        
Number of vessels impaired during the period | Vessel 48        
Fair value of assets incurring impairment $ 303,600        
Net book value of assets $ 1,600,000   $ 1,600,000    
Number of vessels active | Vessel 92   92    
Stacked and Active Vessels          
Derivatives, Fair Value [Line Items]          
Number of vessels operating | Vessel 246   246    
Total carrying value of vessels $ 2,900,000   $ 2,900,000    
[1] Refer to Note (15) for additional information regarding asset impairment charges.