BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 6.9	$ 12.1
Depreciation expense	$ 48.1	$ 48.8	$ 55.2
Concentration risk customer	No single client accounted for more than 10% of our consolidated accounts receivable or revenues as of or for the years ended December 31, 2011, 2010 or 2009.