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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net $ 1,437 $ 609 $ 3,605 $ 1,754
Interest and other debt costs 18,587 13,312 54,018 39,741
Loss before income taxes (299,657) (24,282) (558,359) (61,770)
Tax effect (2,884) (4,679) 4,680 16,996
Net loss attributable to Tidewater Inc. (297,676) (19,509) (565,263) (78,396)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes 185 240 470 984
Tax effect   84   344
Net loss attributable to Tidewater Inc. 185 156 470 640
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net 115 (37) 257 155
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest and other debt costs $ 70 $ 277 $ 213 $ 829