Income taxes - deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Tax loss and credit carryforwards	$ 234,940	$ 210,055
Pension	19,972	28,147
Reserves and accruals	68,767	62,378
Other	3,267	3,619
Less: valuation allowances	(143,971)	(104,799)
Total deferred tax assets	182,975	199,400
Deferred tax liabilities:
Property, plant and equipment	24,315	22,299
Intangibles — stock acquisitions	541,445	553,245
Unremitted foreign earnings	218,769	223,494
Other	4,221	228
Total deferred tax liabilities	788,750	799,266
Net deferred tax liability	$ (605,775)	$ (599,866)