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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012 Y	Dec. 31, 2011
Derivative [Line Items]
U.S. Treasury Note, maturity term (in years)			10
Proceeds from or (payments to) settlement of interest rate protection agreement			$ 65,500,000	$ (9,910,000)
Ineffective portion of derivative instruments	3,400,000
Settlement gains from interest rate protection agreement		2,200,000
Foreign currency forward contracts settled for a loss, amount			700,000
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax			(5,700,000)
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax			(3,500,000)
2003 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement			22,800,000
2008 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement			(4,400,000)
2010 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement			9,900,000
2011 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement			$ (65,500,000)

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months, net of tax.

+ References

No definition available.

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X

- Definition

Amount of loss recorded in accumulated other comprehensive income pertaining to the settlement of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective.

+ References

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- Definition

U.S. Treasury Note, Maturity Term

+ References

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-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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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

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-Subparagraph (a)(1),(2)

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-Publisher FASB

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-Paragraph 44C

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-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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- Definition

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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-Publisher FASB

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-Paragraph 44C

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-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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- Definition

The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

+ References

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-Publisher FASB

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-SubTopic 10

-Section 45

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