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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 1,261 | $ 11,779
Unrealized Losses, Less than 12 Months | 2 | 40
Fair Value, 12 Months or More | 411 | 284
Unrealized Losses, 12 Months or More | 1 | 2
Fair Value | 1,672 | 12,063
Unrealized Losses | 3 | 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 | 243 | 8,998
Unrealized Losses, Less than 12 Months | 0 | 26
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 243 | 8,998
Unrealized Losses | 0 | 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 |  |
Unrealized Losses, 12 Months or More |  |
Fair Value |  | $ 50
Unrealized Losses |  | 0
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 1,018 | 2,731
Unrealized Losses, Less than 12 Months | 2 | 14
Fair Value, 12 Months or More | 411 | 284
Unrealized Losses, 12 Months or More | 1 | 2
Fair Value | 1,429 | 3,015
Unrealized Losses | $ 3 | $ 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 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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