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Summary of Combined Fair Value of Assets Incurred Impairments (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Vessel
Dec. 31, 2016
USD ($)
Vessel
Vehicle
Dec. 31, 2015
USD ($)
Vessel
Asset Impairment Charges [Abstract]        
Number of vessels impaired during the period | Vessel 74 14 115 47
Number of ROVs impaired during the period | Vehicle     8  
Amount of impairment incurred [1] $ 253,422 $ 15,141 $ 419,870 $ 61,771
Combined fair value of assets incurring impairment $ 523,495 $ 90,010 $ 813,851 $ 244,310
[1] Refer to Note (15) for additional information regarding asset impairment charges.