Income Taxes - Principal Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax liabilities:
Tax in excess of book depreciation	$ 34,143	$ 40,389	$ 39,447
Goodwill	58	23
Intangible assets	50,688	86,492	91,947
Other deferred tax liabilities	389	720	0
Total deferred income tax liabilities	85,278	127,624	131,394
Deferred income tax assets:
Goodwill	2,067	1,165	1,697
Inventories	2,248	740	4,370
Pension/Personnel accruals	1,596	1,395	2,669
Net operating loss carry forwards	6,950	10,297	6,289
Foreign tax credits		5,759	3,242
Guarantee claim deduction		414	1,141
Credit carry forwards	3,427	4,581	4,958
Accruals and reserves	2,015	1,151	0
Other deferred tax assets	3,019	10,193	2,084
Deferred income tax assets before Valuation Allowance	21,322	35,695	26,451
Valuation allowance on deferred tax assets	(7,608)	(4,090)	(2,376)
Total deferred income tax assets	13,714	31,605	24,075
Net deferred income tax liabilities	$ 71,564	$ 96,019	$ 107,319