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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended |
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Earning Maximum Rate Until Maturity [Member] | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Principal Return Prior to Maturity [Member] | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Default [Member] | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Liquidity Risk Premium [Member] | Jun. 30, 2013 Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Recovery Rate in Default [Member] | Jun. 30, 2013 Minimum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Earning Maximum Rate Until Maturity [Member] | Jun. 30, 2013 Minimum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Principal Return Prior to Maturity [Member] | Jun. 30, 2013 Minimum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Default [Member] | Jun. 30, 2013 Minimum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Liquidity Risk Premium [Member] | Jun. 30, 2013 Minimum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Recovery Rate in Default [Member] | Jun. 30, 2013 Maximum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Earning Maximum Rate Until Maturity [Member] | Jun. 30, 2013 Maximum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Principal Return Prior to Maturity [Member] | Jun. 30, 2013 Maximum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Cumulative Probability of Default [Member] | Jun. 30, 2013 Maximum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Liquidity Risk Premium [Member] | Jun. 30, 2013 Maximum [Member] Failed Auction Securities [Member] Significant Unobservable Inputs (Level 3) [Member] Recovery Rate in Default [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value | $ 6,438 | $ 6,736 | $ 4,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Technique |  |  | Discounted cash flow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unobservable Input |  |  |  | Cumulative probability of earning the maximum rate until maturity | Cumulative probability of principal return prior to maturity | Cumulative probability of default | Liquidity risk premium | Recovery rate in default |  |  |  |  |  |  |  |  |  |
Weighted Average Interest Rate |  |  |  | 0.03% | 84.23% | 15.74% | 5.00% | 40.00% | 0.01% | 73.19% | 4.72% | 5.00% | 40.00% | 0.05% | 95.27% | 26.76% | 5.00% | 40.00%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + 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=25499696&loc=d3e19207-110258 + Details
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- Definition Weighted average rate use to measure fair value. + References No definition available. + Details
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