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Schedule of Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]      
Deposits $ 2,151 $ 1,780  
Reorganization related retainer payments   50  
Investments held in rabbi trust [1] 45 8,908  
Prepaid expenses   8,392  
Prepaid expenses 8,017 8,442  
Total other current assets $ 10,213 $ 19,130  
Predecessor      
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]      
Deposits     $ 3,057
Reorganization related retainer payments     3,938
Investments held in rabbi trust     8,759
Prepaid expenses     11,414
Total other current assets     $ 18,409
[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.