COMMITMENTS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases Disclosure [Line Items]
Operating lease rentals	$ 27.4	$ 27.5	$ 28.5
Certain former and current senior executives
Leases Disclosure [Line Items]
Present value of expected bonus payments	12.4	10.1
Benefits payable, period	10 years	10 years
Former executive
Leases Disclosure [Line Items]
Present value of expected bonus payments	$ 1.4	$ 1.5
Benefits payable, period	10 years	10 years