BENEFIT OBLIGATIONS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2005
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Termination of pension plan	During the second quarter of 2011, we informed employees who were eligible participants in the pension plan of our plan to terminate the pension plan, subject to approval by the IRS, with the intention of fully distributing plan assets as promptly as practicable following such approval.				As of December 2010, the fair value of plan assets exceeded accumulated benefit obligations for the pension plan.	Effective December 31, 2005, we froze service accruals in the defined benefit pension plan for employees in the United States who did not participate in retirement plans offered by collective bargaining units or our insurance subsidiaries. All active employees who were eligible participants in the defined benefit pension plan, as of December 31, 2005, became 100% vested and have a non-forfeitable right to these benefits as of such date.
Active employees who were eligible participants in the defined benefit pension plan, percentage vested						100.00%
Costs related to defined contribution plans	$ 3.6	$ 3.4	$ 7.2	$ 8.3