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Fair Value Measurements - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Fair Value Disclosures [Abstract] |
Percent of credit loss | 2.00%
Rate of return required | 5.00%
Estimated timeframe for auctions of securities minimum | 3 years
Estimated timeframe for auctions of securities maximum | 5 years
Percentage of liquidity risk premium | 5.00%
Increase or decrease in the liquidity risk premium | 1.00%
Increase or decrease, respectively, the fair value of the Failed Auction Securities | $ 100,000
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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