Senior Notes - Summary of Senior Notes (Detail) - USD ($) $ in Millions	Jul. 14, 2010	May 07, 2008
Series A
Debt Instrument [Line Items]
Amount		$ 41.0
Interest rate		6.37%
Maturity date		May 07, 2013
Series B
Debt Instrument [Line Items]
Amount		$ 40.0
Interest rate		6.37%
Maturity date		May 07, 2015
Series C
Debt Instrument [Line Items]
Amount		$ 63.0
Interest rate		6.71%
Maturity date		May 07, 2015
Series D
Debt Instrument [Line Items]
Amount		$ 131.0
Interest rate		7.18%
Maturity date		May 07, 2018
Series E
Debt Instrument [Line Items]
Amount	$ 60.0
Interest rate	4.72%
Maturity date	Jul. 14, 2016
Series F
Debt Instrument [Line Items]
Amount	$ 72.0
Interest rate	5.04%
Maturity date	Jul. 14, 2017
Series G
Debt Instrument [Line Items]
Amount	$ 28.0
Interest rate	5.42%
Maturity date	Jul. 14, 2019
Series H
Debt Instrument [Line Items]
Amount	$ 85.0
Interest rate	5.59%
Maturity date	Jul. 14, 2020

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: 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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: 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)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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