Income taxes - deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Tax loss and credit carryforwards	$ 174,997	$ 234,940
Lease assets	28,577
Pension	14,971	19,972
Reserves and accruals	60,799	68,767
Other	3,207	3,267
Less: valuation allowances	(119,233)	(143,971)
Total deferred tax assets	163,318	182,975
Deferred tax liabilities:
Property, plant and equipment	23,053	24,315
Intangibles — stock acquisitions	441,079	541,445
Unremitted non-U.S. earnings	81,967	218,769
Lease liabilities	28,577
Other	22,628	4,221
Total deferred tax liabilities	597,304	788,750
Net deferred tax liability	$ (433,986)	$ (605,775)