Other Debt - Barclay's Facility (Details) (Senior Secured Credit Facility [Member], Barclays Bank PLC [Member], USD $) (Detail) (Senior Secured Credit Facility [Member], Barclays Bank PLC [Member], USD $)	1 Months Ended
	Feb. 28, 2014	Dec. 31, 2013
Senior Secured Credit Facility [Member] | Barclays Bank PLC [Member]
Line of Credit Facility [Line Items]
Credit facility, current borrowing capacity		$ 2,100,000,000
Amortization of financing costs	$ 32,600,000