Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Credits and Other Liabilities [Abstract]
Pension liabilities	$ 29,884	$ 33,124
Liability for uncertain tax positions	49,553	43,790
Deferred tax liability	2,658	1,913
Lease liability - operating	4,135
Accrued property and liability losses	1,107	4,123
Other	9,162	11,075
Other liabilities and deferred credits	$ 96,499	$ 94,025