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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Deferred Credits and Other Liabilities [Abstract]      
Postretirement benefits liability $ 2,420 $ 2,642  
Pension liabilities 36,526 36,614  
Deferred supplemental savings plan liability 5,277 6,592  
Other   19,320  
Other 13,462 12,728  
Other liabilities and deferred credits $ 57,685 $ 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