STOCKHOLDERS' EQUITY - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders Equity Note [Line Items]
Antidilutive securities excluded from determination of diluted earnings per common share	500,000	500,000	1,000,000
Shares forfeited	72,000	106,000
Outstanding exercisable stock options	101,000	128,000	158,000
Stock options exercised	26,568	28,319	19,472
Stock options exercised, aggregate intrinsic value	$ 0.9	$ 0.6	$ 0.2
Stock options outstanding, aggregate intrinsic value	3.1
Restricted Stock
Stockholders Equity Note [Line Items]
Share based compensation	25.1	29.8	23.3
Unrecognized compensation cost	$ 49.8	$ 50.9	$ 54.1
Restricted Stock | Minimum
Stockholders Equity Note [Line Items]
Restricted stock and restricted stock unit grants, vesting period	2 years
Restricted Stock | Maximum
Stockholders Equity Note [Line Items]
Restricted stock and restricted stock unit grants, vesting period	4 years
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Shares forfeited	15,670
Weighted average remaining vesting period	0.95