Schedule of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]
Salaries, wages and related fringe benefits	$ 59,316		$ 59,080
Taxes	24,525		34,891
Advance payments on sales contracts	50,599		40,689
Product warranties	24,693	24,606	22,939	23,006	23,531	19,100
Other	51,768		55,949
Total accrued liabilities	$ 210,901		$ 213,548