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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 23,877 | $ 15,664
Unrealized Losses, Less than 12 Months | (64) | (60)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 23,877 | 15,664
Unrealized Losses | (64) | (60)
U.S. Treasury securities, obligations of U.S. Government agencies and municipals |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 23,601 | 14,663
Unrealized Losses, Less than 12 Months | (64) | (59)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 23,601 | 14,663
Unrealized Losses | (64) | (59)
Foreign government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months |  | 0
Unrealized Losses, Less than 12 Months |  | 0
Fair Value, 12 Months or More |  | 0
Unrealized Losses, 12 Months or More |  | 0
Fair Value |  | 0
Unrealized Losses |  | 0
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 276 | 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 | 276 | 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 recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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