Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Credits and Other Liabilities [Abstract]
Pension liabilities	$ 33,295	$ 33,124
Liability for uncertain tax positions	44,676	43,790
Deferred tax liability	1,919	1,913
Lease liability - operating	4,420
Accrued property and liability losses	3,500	4,123
Other	9,661	11,075
Other liabilities and deferred credits	$ 97,471	$ 94,025