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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income and other, net $ (128)  
Interest and other debt costs 7,599  
Loss before income taxes (35,708)  
Tax effect 3,321  
Net loss attributable to Tidewater Inc. (39,172)  
Predecessor    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income and other, net   $ 1,588
Interest and other debt costs   21,008
Loss before income taxes   (85,255)
Tax effect   1,717
Net loss attributable to Tidewater Inc.   (94,855)
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loss before income taxes 361  
Net loss attributable to Tidewater Inc. 361  
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 $ 361  
Reclassification out of Accumulated Other Comprehensive Income | Predecessor    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loss before income taxes   2,465
Tax effect   1,027
Net loss attributable to Tidewater Inc.   1,438
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   325
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