INCOME TAXES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Taxes [Line Items]
Statutory U.S. federal income tax rate	35.00%
Valuation allowance	$ 20.1	$ 14.4
State net operating loss carryforwards	63.7
Foreign net operating loss carryforwards	62.4
Net operating loss carryforwards, beginning year of expiration	The state net operating loss carryforwards begin to expire in 2012.
Research and development credit carry forward	38.2	32.6
Research and development credit carry forward, expiration year	The Company had federal and state research and development tax credit carryforwards of $38.2, which expire from 2012 to 2026.
Earnings from foreign subsidiaries that residual U.S. income taxes is not provided	370.3
Gross uncertain tax position	21.7	21.5	18.5	15.1
Liability for unrecognized tax benefits that would affect effective tax rate, if recognized	19.2
Cumulative unrealized tax deductions related to stock option exercises and vested restricted shares	85.8
Realized tax deductions related to stock option exercises and vested restricted shares	30.8
Number of tax years the company is currently open to audit by tax authorities	4
Minimum
Income Taxes [Line Items]
Liability for unrecognized tax benefits for interest and penalties	$ 1.0	$ 1.0