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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   $ 57,536  
Total fair value of plan assets [1] $ 45 8,908  
Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     $ 57,146
Total fair value of plan assets     8,759
Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   8,909  
Other pending transactions   (1)  
Total fair value of plan assets 45 8,908  
Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     8,760
Total fair value of plan assets     8,760
Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   56,928  
Accrued income   608  
Total fair value of plan assets   57,536  
Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     56,465
Accrued income     681
Total fair value of plan assets     57,146
Other | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,404  
Other | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,298
Measured At Net Asset Value | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,725  
Total fair value of plan assets 45 1,725  
Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,720
Total fair value of plan assets     1,720
Cash and Cash Equivalents | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets 45 246  
Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     323
Cash and Cash Equivalents | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   834  
Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     989
Cash and Cash Equivalents | Measured At Net Asset Value | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets $ 45 49  
Cash and Cash Equivalents | Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     72
Equity Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   5,295  
Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   3,368  
Debt Securities | Measured At Net Asset Value | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,676  
US Government Agencies Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,692  
US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,613
US Government Agencies Debt Securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   4,238  
US Government Agencies Debt Securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     3,770
Collateralized mortgage securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,032  
Collateralized mortgage securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     2,537
Corporate Debt Securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   49,420  
Corporate Debt Securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     47,871
Common stock | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   3,599  
Common stock | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     3,561
Foreign Stock | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   183  
Foreign Stock | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     132
American Depository Receipts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,429  
American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,387
Preferred American Depository Receipts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   12  
Preferred American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     20
Real Estate Investment Trusts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   72  
Real Estate Investment Trusts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     76
Open Ended Mutual Funds | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,676  
Open Ended Mutual Funds | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,648
Open Ended Mutual Funds | Measured At Net Asset Value | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,676  
Open Ended Mutual Funds | Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,648
Quoted Prices In Active Markets (Level 1) | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   6,173  
Other pending transactions   (1)  
Total fair value of plan assets   6,172  
Quoted Prices In Active Markets (Level 1) | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     6,023
Total fair value of plan assets     6,023
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   4,629  
Accrued income   608  
Total fair value of plan assets   5,237  
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     4,215
Accrued income     681
Total fair value of plan assets     4,896
Quoted Prices In Active Markets (Level 1) | Other | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   172  
Quoted Prices In Active Markets (Level 1) | Other | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     100
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   27  
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     15
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   219  
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     345
Quoted Prices In Active Markets (Level 1) | Equity Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   5,295  
Quoted Prices In Active Markets (Level 1) | Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   851  
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   851  
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     832
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   4,238  
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     3,770
Quoted Prices In Active Markets (Level 1) | Common stock | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   3,599  
Quoted Prices In Active Markets (Level 1) | Common stock | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     3,561
Quoted Prices In Active Markets (Level 1) | Foreign Stock | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   183  
Quoted Prices In Active Markets (Level 1) | Foreign Stock | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     132
Quoted Prices In Active Markets (Level 1) | American Depository Receipts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,429  
Quoted Prices In Active Markets (Level 1) | American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,387
Quoted Prices In Active Markets (Level 1) | Preferred American Depository Receipts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   12  
Quoted Prices In Active Markets (Level 1) | Preferred American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     20
Quoted Prices In Active Markets (Level 1) | Real Estate Investment Trusts | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   72  
Quoted Prices In Active Markets (Level 1) | Real Estate Investment Trusts | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     76
Level 2 | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,011  
Total fair value of plan assets   1,011  
Level 2 | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,017
Total fair value of plan assets     1,017
Level 2 | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   52,299  
Total fair value of plan assets   52,299  
Level 2 | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     52,250
Total fair value of plan assets     52,250
Level 2 | Other | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,232  
Level 2 | Other | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     1,198
Level 2 | Cash and Cash Equivalents | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   170  
Level 2 | Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     236
Level 2 | Cash and Cash Equivalents | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   615  
Level 2 | Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     644
Level 2 | Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   841  
Level 2 | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   841  
Level 2 | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     781
Level 2 | Collateralized mortgage securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   1,032  
Level 2 | Collateralized mortgage securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     2,537
Level 2 | Corporate Debt Securities | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets   $ 49,420  
Level 2 | Corporate Debt Securities | Pension Plans, Defined Benefit | Predecessor      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of plan assets     $ 47,871
[1] Tidewater converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.