Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred Credits and Other Liabilities [Abstract]
Pension liabilities	$ 33,020	$ 33,124
Liability for uncertain tax positions	44,341	43,790
Deferred tax liability	2,082	1,913
Lease liability - operating	4,419
Accrued property and liability losses	4,008	4,123
Other	10,226	11,075
Other liabilities and deferred credits	$ 98,096	$ 94,025