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Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | $ 317,195
Unrealized losses, less than 12 months | (779)
Fair value, 12 months or greater | 149,642
Unrealized losses, 12 months or greater | (681)
Total fair value | 466,837
Total unrealized losses | (1,460)
Treasury Bills |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | 137,108
Unrealized losses, less than 12 months | (174)
Fair value, 12 months or greater | 63,030
Unrealized losses, 12 months or greater | (124)
Total fair value | 200,138
Total unrealized losses | (298)
Corporate Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | 116,028
Unrealized losses, less than 12 months | (386)
Fair value, 12 months or greater | 42,922
Unrealized losses, 12 months or greater | (297)
Total fair value | 158,950
Total unrealized losses | (683)
Asset-Backed Securities |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | 57,678
Unrealized losses, less than 12 months | (207)
Fair value, 12 months or greater | 38,256
Unrealized losses, 12 months or greater | (200)
Total fair value | 95,934
Total unrealized losses | (407)
Sovereign Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | 3,527
Unrealized losses, less than 12 months | (6)
Fair value, 12 months or greater | 4,592
Unrealized losses, 12 months or greater | (47)
Total fair value | 8,119
Total unrealized losses | (53)
Municipal Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, less than 12 months | 2,854
Unrealized losses, less than 12 months | (6)
Fair value, 12 months or greater | 842
Unrealized losses, 12 months or greater | (13)
Total fair value | 3,696
Total unrealized losses | $ (19)

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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