Schedule of Valuation And Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for doubtful accounts receivable
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 6,369		$ 9,593		$ 6,098
Additions Charged to Costs and Expenses	25		1,599		5,741
Addition through acquisition	532
Other changes Add (Deduct)	(2,453)	[1]	(4,823)	[1]	(2,246)	[1]
Balance at End of Period	4,473		6,369		9,593
Allowance for obsolete inventory
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	16,210		15,593		17,216
Additions Charged to Costs and Expenses	4,611		5,840		6,400
Addition through acquisition	725
Other changes Add (Deduct)	(5,603)	[2]	(5,223)	[2]	(8,023)	[2]
Balance at End of Period	$ 15,943		$ 16,210		$ 15,593

[1] Uncollectible accounts receivable written off, net of recoveries.

[2] Inventory disposals, net of recoveries