Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Book expenses capitalized for tax	$ 7,204	$ 8,213
Postretirement benefits	18,027	19,282
Inventory reserves	5,550	4,780
Vacation allowances	1,036	1,240
Net operating losses and tax credit carryforwards	6,711	7,558
Post employment benefits	757	1,006
Foreign tax credit carryforwards (expiring in 2019)	2,227	212
Stock options	10,185	9,672
Liability insurance	3,686	2,754
Basis of capital assets	891	1,013
Warranties	3,049	3,078
Reserve for doubtful accounts	1,569	1,547
Other	9,313	5,063
Total deferred tax assets	70,205	65,418
Valuation allowances	(4,938)	(3,961)
Net deferred tax assets	65,267	61,457
Property, plant and equipment	(8,935)	(10,547)
Pension	(40,833)	(10,915)
Intangibles	(25,212)	(21,492)
Other	(2,455)	(1,110)
Total deferred tax liabilities	(77,435)	(44,064)
Net deferred taxes	$ (12,168)	$ 17,393