Long-term Debt - Propco Credit Agreement (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Jan. 03, 2012	Dec. 31, 2011	Jun. 18, 2011
Debt Instrument [Line Items]
Long-term debt	$ 2,068,536,000		$ 2,195,227,000
Propco [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Number of additional extension periods for debt instrument				2
Debt instrument, term of extension period	1 year
Debt instrument, extension fee (percentage)	1.00%
Periodic principal payment on debt instrument, (percentage)	0.25%
Propco [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Number of debt tranches				3
Long-term debt, principal amount				1,575,000,000
Percentage of debt hedged by interest rate derivatives	50.00%
Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount				200,000,000
Long-term debt	140,992,000		169,952,000
Basis spread on variable interest rate	3.22%		3.30%
Description of variable interest rate basis	LIBOR or base rate
Propco [Member] | Tranche B-2 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount				750,000,000
Long-term debt	663,049,000		668,520,000
Basis spread on variable interest rate	4.22%		4.30%
Description of variable interest rate basis	LIBOR or base rate
Propco [Member] | Tranche B-3 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount		625,000,000		625,000,000
Long-term debt	0		501,369,000
Basis spread on variable interest rate			2.37%
Description of variable interest rate basis	LIBOR or base rate
Propco [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount		625,000,000
Long-term debt	520,965,000		0
Description of variable interest rate basis	Increasing fixed rate
Propco [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	35,111,000		71,010,000
Basis spread on variable interest rate	3.71%		3.86%
Description of variable interest rate basis	LIBOR or base rate
Debt instrument, fee for unfunded portion of revolving debt (percentage)	0.50%
Prepayment of principal on debt instrument	15,000,000
Minimum [Member] | Propco [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Period required to maintain hedge on debt instrument	3 years
1st Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment of principal based on excess cash flows (percentage)	75.00%
Debt instrument, covenant description	total leverage ratio is equal to or greater than 6.00:1.00
2nd Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment of principal based on excess cash flows (percentage)	50.00%
Debt instrument, covenant description	total leverage ratio is less than 6.00:1.00 but greater than or equal to 4.00:1.00
3rd Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment of principal based on excess cash flows (percentage)	25.00%
Debt instrument, covenant description	total leverage ratio is less than 4.00:1.00
Interest Rate Swap [Member] | Propco [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Derivative, notional amount				$ 850,000,000
Derivative, fixed interest rate	1.29%
Derivative, description of variable rate basis	LIBOR
Minimum [Member] | 1st Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	6
Minimum [Member] | 2nd Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	4
Maximum [Member] | 2nd Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	6
Maximum [Member] | 3rd Tier [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	4
LIBOR [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Description of variable interest rate basis	LIBOR
LIBOR [Member] | Propco [Member] | Tranche B-2 [Member]
Debt Instrument [Line Items]
Description of variable interest rate basis	LIBOR
LIBOR [Member] | Maximum [Member] | Propco [Member] | Tranche B-2 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	4.00%
LIBOR [Member] | Maximum [Member] | Propco [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.00%
LIBOR [Member] | Interest Rate Swap [Member] | Propco [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Derivative instrument, term for variable interest rate	1 month
LIBOR [Member] | Year 1 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.00%
LIBOR [Member] | Year 2 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.00%
LIBOR [Member] | Year 3 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.00%
LIBOR [Member] | Year 4 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.50%
LIBOR [Member] | Year 5 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.50%
LIBOR [Member] | Year 6 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	4.50%
LIBOR [Member] | Year 7 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	5.50%
Base Rate [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Description of variable interest rate basis	base rate
Base Rate [Member] | Maximum [Member] | Propco [Member] | Tranche B-2 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.00%
Base Rate [Member] | Maximum [Member] | Propco [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.00%
Base Rate [Member] | Minimum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	1.00%
Description of variable interest rate basis	LIBOR
Base Rate [Member] | Year 1 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.00%
Base Rate [Member] | Year 2 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.00%
Base Rate [Member] | Year 3 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.00%
Base Rate [Member] | Year 4 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.50%
Base Rate [Member] | Year 5 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.50%
Base Rate [Member] | Year 6 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	3.50%
Base Rate [Member] | Year 7 [Member] | Maximum [Member] | Propco [Member] | Tranche B-1 [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	4.50%