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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net $ 2,914   $ 2,786  
Interest and other debt costs 7,547   15,146  
Loss before income taxes (5,385)   (41,093)  
Tax effect 5,797   9,118  
Net loss attributable to Tidewater Inc. (10,940)   (50,112)  
Predecessor        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net   $ 1,680   $ 3,268
Interest and other debt costs   10,605   31,613
Loss before income taxes   (524,115)   (609,370)
Tax effect   295   2,012
Net loss attributable to Tidewater Inc.   (524,434)   (619,289)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes 43   404  
Net loss attributable to Tidewater Inc. 43   404  
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 $ 43   $ 404  
Reclassification out of Accumulated Other Comprehensive Income | Predecessor        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes   80   2,545
Tax effect       1,027
Net loss attributable to Tidewater Inc.   80   1,518
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net   $ 80   405
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest and other debt costs       $ 2,140