Long-Term Obligations (Schedule of GTP Securitizations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Oct. 02, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 14,478,278,000			$ 8,753,376,000
Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Long-term debt	1,537,881,000	[1]	1,490,000,000	0	[1]
Repayments of long-term debt	700,000
Series 2010-1 Class C Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	4.436%
Series 2010-1 Class C Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	200,000,000
Series 2010-1 Class F Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	8.112%
Series 2010-1 Class F Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	50,000,000
Series 2011-1 Class C Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	3.967%
Series 2011-1 Class C Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	70,000,000
Series 2011-2 Class C Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	4.347%
Series 2011-2 Class C Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	490,000,000
Series 2011-2 Class F Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	7.628%
Series 2011-2 Class F Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	155,000,000
Series 2012-1 Class A Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	3.721%	[2]
Series 2012-1 Class A Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	100,000,000	[2]
Series 2012-2 Class A Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	4.336%	[2]
Series 2012-2 Class A Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	114,000,000	[2]
Series 2012-2 Class B Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	6.413%
Series 2012-2 Class B Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	41,000,000
Series 2012-2 Class C Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	7.358%
Series 2012-2 Class C Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	27,000,000
Series 2013-1 Class C Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	2.364%
Series 2013-1 Class C Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	190,000,000
Series 2013-1 Class F Notes [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate	4.704%
Series 2013-1 Class F Notes [Member] | Secured Debt [Member] | GTP Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 55,000,000

[1] Includes approximately $48.0 million of unamortized premium recorded as a result of fair value adjustments for debt assumed upon acquisition of MIPT.

[2] Does not reflect MIPT’s repayment of approximately $1.4 million aggregate principal amount prior to the date of acquisition and the Company’s repayment of approximately $0.7 million aggregate principal amount after the date of acquisition in accordance with the repayment schedules.