Interest rate stated in the contractual debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Interest Rate Swap Terms and Positions (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended		1 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Interest rate swaps	May 31, 2012 Senior Notes Due 2019 [Member]	Sep. 30, 2012 Senior Notes Due 2019 [Member]	Aug. 31, 2011 Senior Notes Due 2016 [Member]	Sep. 30, 2012 Senior Notes Due 2016 [Member]
Derivative [Line Items]
Annual interest rate	4.00%			7.25%		10.375%
Swap Interest Rates - Receive		7.25%
Cash proceeds from termination of interest rate swap			$ 1.2		$ 2.9