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Financial instruments - Fair Value Amounts of Derivative Instruments and Their Effect on Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	$ 1,730	$ (1,126)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Commodity Contract [Member] | U.S. Treasury Futures [Member] | Principal or Proprietary Transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	(119)	257
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Commodity Contract [Member] | Federal Funds Futures [Member] | Principal or Proprietary Transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	55	188
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Other Contract [Member] | Auction rate securities purchase commitments [Member] | Principal or Proprietary Transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	1,794	(1,560)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Interest Rate Contracts [Member] | Interest Rate Cap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)		(11)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)

X

- Definition

Gain loss on derivatives pre tax recognized in income.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 4

-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.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959

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