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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability $ 2,524 $ 2,642
Pension liabilities 36,420 36,614
Deferred supplemental savings plan liability 6,557 6,592
Other 12,559 12,728
Other liabilities and deferred credits $ 58,060 $ 58,576