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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 1,498 | $ 8,483
Unrealized Losses, Less than 12 Months | 3 | 12
Fair Value, 12 Months or More | 485 | 0
Unrealized Losses, 12 Months or More | 2 | 0
Fair Value | 1,983 | 8,483
Unrealized Losses | 5 | 12
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 |  | 3,994
Unrealized Losses, Less than 12 Months |  | 1
Fair Value, 12 Months or More |  | 0
Unrealized Losses, 12 Months or More |  | 0
Fair Value |  | 3,994
Unrealized Losses |  | 1
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 | 1,498 | 4,439
Unrealized Losses, Less than 12 Months | 3 | 11
Fair Value, 12 Months or More | 485 | 0
Unrealized Losses, 12 Months or More | 2 | 0
Fair Value | 1,983 | 4,439
Unrealized Losses | $ 5 | $ 11

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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=27724398&loc=d3e27290-111563 + Details
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