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Fair Value Measurements - Additional Information (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013
Fair Value Disclosures [Abstract] |
Percent of credit loss | 6.60%
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 | $ 300,000

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