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Investments in Debt and Equity Securities and Other Investments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 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) | $ 3,561 |  | $ 3,561 |  | $ 2,589
Unrealized gain (losses) on investments, net of tax | 638 | $ (99) | 867 | $ 283 |
Proceeds from sale of investments available for sale |  |  | 1,347 | 385 |
Pre tax reclassification of net investment realized gain (loss) into net income |  |  | 152 | 284 |
Reclassification of net investment realized gain (loss) into net income, net of tax |  |  | 93 | $ 173 |
HealthCare Partners (HCP) |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Required minimum cash balance | 58,437 |  | 58,437 |  |
Preferred Stock |  |  |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |  |  |
Preferred stock, in a privately held company | $ 6,250 |  | 6,250 |  |
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 |  |  | 1,124 |  |
Unrealized gain (losses) on investments, net of tax |  |  | $ 718 |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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