VALUATION AND ALLOWANCE ACCOUNTS (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for doubtful accounts, beginning balance	$ 10,845		$ 8,709		$ 6,616
Allowance for doubtful accounts, charges to expenses	7,079		7,524		6,866
Allowance for doubtful accounts, other charges/(reversals)	6,807	[1]	(190)	[1]	765	[1]
Allowance for doubtful accounts, write-offs/ Payments	(5,826)		(5,198)		(5,538)
Allowance for doubtful accounts, ending balance	$ 18,905		$ 10,845		$ 8,709

[1] Amounts consist primarily of valuation allowances assumed from acquired companies and currency translation adjustments.