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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 5,803 | $ 11,779
Unrealized Losses, Less than 12 Months | (5) | (40)
Fair Value, 12 Months or More | 160 | 284
Unrealized Losses, 12 Months or More | 0 | (2)
Fair Value | 5,963 | 12,063
Unrealized Losses | (5) | (42)
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 | 5,102 | 8,998
Unrealized Losses, Less than 12 Months | (5) | (26)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 5,102 | 8,998
Unrealized Losses | (5) | (26)
Foreign government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months |  | 50
Unrealized Losses, Less than 12 Months |  | 0
Fair Value, 12 Months or More |  | 0
Unrealized Losses, 12 Months or More |  | 0
Fair Value |  | 50
Unrealized Losses |  | 0
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 701 | 2,731
Unrealized Losses, Less than 12 Months | 0 | (14)
Fair Value, 12 Months or More | 160 | 284
Unrealized Losses, 12 Months or More | 0 | (2)
Fair Value | 861 | 3,015
Unrealized Losses | $ 0 | $ (16)

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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 securities classified as available-for-sale recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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