Income taxes - deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Tax loss and credit carryforwards	$ 123,328	$ 112,796
Pension	57,610	63,669
Reserves and accruals	47,755	43,482
Other	34,568	28,820
Less: valuation allowances	(103,475)	(99,141)
Total deferred tax assets	159,786	149,626
Deferred tax liabilities:
Property, plant and equipment	33,824	32,329
Intangibles — stock acquisitions	361,132	384,734
Unremitted foreign earnings	78,019	116,595
Other	453	11,160
Total deferred tax liabilities	473,428	544,818
Net deferred tax liability	$ (313,642)	$ (395,192)