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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Available for sale investments gross pre-tax unrealized gain (loss) | $ 4,934 |  | $ 4,934 |  | $ 2,589
Unrealized gain (losses) on investments, net of tax | 1,121 | $ (1,651) | 1,988 | $ (1,368) |
Proceeds from sale of investments available for sale debt securities |  |  | 4,645 |  |
Proceeds from sale of investments available for sale |  |  |  | 1,961 |
Pre tax reclassification of net investment realized gain (loss) into net income |  |  | 233 | 617 |
Reclassification of net investment realized gain (loss) into net income, net of tax |  |  | 143 | $ 376 |
HealthCare Partners (HCP) |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Required minimum cash balance | $ 58,127 |  | 58,127 |  |
Certificates of deposit, commercial paper and money market funds |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Unrealized gain (losses) on investments, pre tax |  |  | 2,578 |  |
Unrealized gain (losses) on investments, net of tax |  |  | $ 1,781 |  |

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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