Income Taxes - The Tax Effects of the Temporary Differences (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred income tax liabilities:
Tax in excess of book depreciation	$ 6,673	$ 6,670	$ 5,099
Goodwill	2,213	1,987	1,821
Allowance for bad debts			18
Other deferred tax liabilities	63	112	843
Gross deferred income tax liabilities	8,949	8,769	7,781
Deferred income tax assets:
Goodwill	3,215	4,141	4,846
Inventories	836	768	167
Pension/Personnel accruals	856	921	503
Deductions for uncollectible Eltmann receivables			310
Net operating loss carry forwards	1,351	3,682	7,526
Foreign tax credits	3,026	3,844	3,326
Guarantee claim deduction	1,141	1,141
Accruals and reserves	114	293
Other deferred tax assets	832	550	421
Gross deferred income tax assets	11,371	15,340	17,099
Valuation allowance on deferred tax assets	(1,434)	(2,252)	(12,066)	(16,604)
Net deferred income tax assets	9,937	13,088	5,033
Net deferred income tax assets (liabilities)	$ 988	$ 4,319	$ (2,748)