BORROWING ARRANGEMENTS - Unsecured Borrowings - $575 Million 6.75% Senior Notes due 2022 (Narrative) (Detail 6) (USD $)						12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Non-Guarantor Subsidiaries	Dec. 31, 2011 Non-Guarantor Subsidiaries	Dec. 31, 2012 Initial 2022 Notes	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes	Oct. 04, 2010 Unsecured Borrowings Initial 2022 Notes	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes Non-Guarantor Subsidiaries	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes Redemption during 12 month periods beginning on 15 th October 2015	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes Redemption during 12 month periods beginning on 15 th october 2016	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes Redemption during 12 month periods beginning on 15 th october 2017	Dec. 31, 2012 Unsecured Borrowings Initial 2022 Notes Redemption on or after 15 th october 2018	Dec. 31, 2012 Unsecured Borrowings Additional 2022 Notes	Nov. 23, 2010 Unsecured Borrowings Additional 2022 Notes	Dec. 31, 2012 Unsecured Borrowings Senior notes due, 2014	Jun. 02, 2011 Unsecured Borrowings Exchange notes	Oct. 20, 2010 Unsecured Borrowings Exchange notes
Borrowing Arrangements [Line Items]
Senior notes, principal amount					$ 575,000,000	$ 575,000,000	$ 225,000,000							$ 350,000,000	$ 310,000,000
Current Rate	10.00%					6.75%	6.75%							6.75%	7.00%
Redemption price percentage									103.375%	102.25%	101.125%	100.00%
Maximum percentage of redeemable notes						35.00%
Redemption price if redeemed in the first three years (in percent)						106.75%
Redemption price if the company undergoes change of control (in percent)						101.00%
Notes issued, issue price (in percent)						98.984%									103.00%
Proceeds of issuance of notes payable						223,000,000							364,000,000
Total assets	2,982,005,000	2,557,312,000	597,896,000	477,292,000				597,900,000
Notes issuable in exchange, face amount																$ 575,000,000	$ 200,000,000
Notes issuable in exchange, interest rate																6.75%	7.50%