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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 24,644 | $ 15,664
Unrealized Losses, Less than 12 Months | (60) | (60)
Fair Value, 12 Months or More | 7,364 | 0
Unrealized Losses, 12 Months or More | 34 | 0
Fair Value | 32,008 | 15,664
Unrealized Losses | (94) | (60)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 24,444 | 14,663
Unrealized Losses, Less than 12 Months | (60) | (59)
Fair Value, 12 Months or More | 7,364 | 0
Unrealized Losses, 12 Months or More | 34 | 0
Fair Value | 31,808 | 14,663
Unrealized Losses | (94) | (59)
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 200 | 1,001
Unrealized Losses, Less than 12 Months | 0 | (1)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 200 | 1,001
Unrealized Losses | $ 0 | $ (1)

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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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