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Guarantor Subsidiaries (Narrative) (Detail) (USD $) In Billions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Guarantor subsidiary borrowings under the senior secured credit facilities	$ 7.3
Guarantor subsidiary borrowings under the senior secured credit facilities		$ 7.3	$ 7.3

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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