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Fair Value Option - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||||
| Fair value of financial instruments more than one day past due | $ 3,004 | [1] | $ 57,837 | [1] | ||
| Fair value of financial instruments with non-accrual status | 0 | |||||
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Loans And Receivables
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| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||||
| Fair value of financial instruments more than one day past due | 0 | |||||
| Fair value of financial instruments with non-accrual status | 0 | |||||
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Corporate Bonds
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| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||||
| Fair value of financial instruments more than one day past due | 0 | 0 | ||||
| Fair value of financial instruments with non-accrual status | $ 0 | $ 0 | ||||
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