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Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 9 Months Ended
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Level 3 [Member] | Dec. 31, 2011 Level 3 [Member] | Sep. 30, 2012 Level 3 [Member] Auction Rate Securities [Member] | Sep. 30, 2012 Minimum [Member] Level 3 [Member] Auction Rate Securities [Member] | Sep. 30, 2012 Maximum [Member] Level 3 [Member] Auction Rate Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  |  |  |  | $ 120,306 | [1] |  |  |  |
Valuation Adjustment |  |  |  |  |  |  |  |  | 5,256 | [1] |  |  |  |
Fair Value | $ 11,847 | [2] | $ 46,958 | [2] | $ 12,805 | [2] | $ 12,482 | [2] | $ 115,050 | [1] |  |  |  |
Valuation Technique |  |  |  |  |  |  |  |  | Discounted Cash Flow | [1] |  |  |  |
Discount Rate |  |  |  |  |  |  |  |  |  |  | 1.14% |  | 3.01% |
Duration |  |  |  |  |  |  |  |  |  |  | 5 years |  | 8 years |
Current Yield |  |  |  |  |  |  |  |  |  |  | 0.27% | [3] | 1.37% | [3]
[1] | Includes ARS owned by the Company of $79.8 million included in the condensed consolidated balance sheet at September 30, 2012 as well as additional commitments to purchase ARS from clients of $40.5 million which is disclosed in the notes to the co
[2] | Included in other assets on the condensed consolidated balance sheet.
[3] | Based on current auctions in comparable securities that have not failed

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- Definition Fair value unobservable input current yield. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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