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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Failed Auction Security [Member] - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Estimated Fair Value | $ 2,546
Cumulative Probability of Earning Maximum Rate Until Maturity [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Technique | Discounted cash flow
Unobservable Input | Cumulative probability of earning the maximum rate until maturity
Weighted Average Interest Rate | 0.08%
Cumulative Probability of Principal Return Prior to Maturity [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unobservable Input | Cumulative probability of principal return prior to maturity
Weighted Average Interest Rate | 94.01%
Cumulative Probability of Default [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unobservable Input | Cumulative probability of default
Weighted Average Interest Rate | 5.91%
Liquidity Risk Premium [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unobservable Input | Liquidity risk premium
Weighted Average Interest Rate | 5.00%
Recovery Rate in Default [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unobservable Input | Recovery rate in default
Weighted Average Interest Rate | 40.00%

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