Income taxes - deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Tax loss and credit carryforwards	$ 210,055	$ 136,046
Pension	28,147	46,563
Reserves and accruals	62,378	52,343
Other	3,619	17,704
Less: valuation allowances	(104,799)	(104,520)
Total deferred tax assets	199,400	148,136
Deferred tax liabilities:
Property, plant and equipment	22,299	32,209
Intangibles — stock acquisitions	553,245	321,707
Unremitted foreign earnings	223,494	63,419
Other	228	466
Total deferred tax liabilities	799,266	417,801
Net deferred tax liability	$ (599,866)	$ (269,665)