Borrowings (Convertible Senior Notes Due 2013) (Narrative) (Detail) (Convertible Senior Notes Due 2013 [Member], USD $)	9 Months Ended
Sep. 30, 2011
Convertible Senior Notes Due 2013 [Member]
Borrowings [Line Items]
Debt instrument issuance amount	$ 310,000,000
Interest rate percentage on issued debt	3.00%
Year of maturity of debt	2013
Converted share	14.7113
Principal amount of initial conversion rate	1,000
Accrued interest	$ 400,000

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Principal amount of initial conversion rate

+ References

No definition available.

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Year the original debt was scheduled to mature, in CCYY format.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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- Definition

Interest rate stated in the contractual debt agreement.

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-Number 210

-Section 02

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

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