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Notes Payable - Components of Notes Payable (Parenthetical) (Detail) (4.03% Senior Notes due in 2018 [Member])	12 Months Ended
	Dec. 31, 2013	Apr. 21, 2011
4.03% Senior Notes due in 2018 [Member]
Debt Instrument [Line Items]
Senior Notes, interest rate	4.03%	4.03%
Senior Notes, year of maturity	2018

X

- Definition

Debt Instrument Maturity Year

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

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

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