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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability $ 2,642  
Pension liabilities 36,614  
Other 19,320  
Other liabilities and deferred credits $ 58,576  
Predecessor    
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability   $ 4,394
Pension liabilities   40,339
Deferred gain on vessel sales   88,923
Other   21,049
Other liabilities and deferred credits   $ 154,705