Income Taxes - Principal Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax liabilities:
Tax in excess of book depreciation	$ 44,834	$ 37,425
Intangible assets	73,405	80,623
Operating lease liabilities	17,527
Other deferred tax liabilities	4,857	794
Total deferred income tax liabilities	140,623	118,842
Deferred income tax assets:
Interest expense limitation	14,674	9,968
Goodwill	304	1,441
Inventories	3,466	2,745
Interest rate swap	2,839	0
Pension/Personnel accruals	495	1,317
Operating lease right-of-use assets	19,313
Net operating loss carry forwards	15,876	9,321
U.S. foreign tax credit carryforwards	3,360	5,345
R&D credit carryforwards	2,654	917
Non-U.S. credit carryforwards	3,313	4,130
Accruals and reserves	2,299	1,531
Other deferred tax assets	5,264	4,749
Deferred income tax assets before valuation allowance	73,857	41,464
Valuation allowance on deferred tax assets	(19,033)	(14,460)	$ (7,608)
Total deferred income tax assets	54,824	27,004
Net deferred income tax liabilities	$ 85,799	$ 91,838