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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Available for sale investments gross pre-tax unrealized gain (loss) | $ 6,783 |  | $ 6,783 |  | $ 3,701
Unrealized gains on investments | 1,057 | $ 638 | 2,614 | $ 867 |
Proceeds from sale of mutual funds and debt securities |  |  | 5,049 |  |
Pre tax reclassification of net investment realized gain (loss) into net income |  |  | (346) | (152) |
Reclassification of net investment realized gain (loss) into net income, net tax |  |  | (211) | (93) |
Proceeds from sale of investments available for sale |  |  |  | $ 1,347 |
HealthCare Partners (HCP) |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Required minimum cash balance | $ 56,717 |  | 56,717 |  |
Certificates of deposit, commercial paper and money market funds due within one year |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  |  | 3,428 |  |
Unrealized gains on investments |  |  | $ 2,616 |  |

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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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