Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for doubtful accounts, beginning balance	$ 18,905		$ 10,845		$ 8,709
Allowance for doubtful accounts, charges to expenses	4,634		7,079		7,524
Allowance for doubtful accounts, other charges/(reversals)	414	[1]	6,807	[1]	(190)	[1]
Allowance for doubtful accounts, write-offs/ Payments	(4,510)		(5,826)		(5,198)
Allowance for doubtful accounts, ending balance	19,443		18,905		10,845
Valuation allowance on deferred tax assets Balance Beginning of Period	3,775		11,973		7,249
Valuation allowance on deferred tax assets Additions /(Deduction) Charged to ( From) Income Tax Expense	0		(663)		0
Valuation allowance on deferred tax assets Other Charges to Reserves	(435)	[2]	(7,535)	[2]	4,724	[2]
Valuation allowance on deferred tax assets Balance End of Period	$ 3,340		$ 3,775		$ 11,973

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

[2] (2) Amounts consist primarily of valuation allowances on acquired deferred tax assets from business combinations.