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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Available for sale investments gross pre-tax unrealized gain (loss) | $ 3,701 | $ 2,589
Proceeds from sale of investments available for sale | 14,971 | 1,295
Pre tax reclassification of net investment realized gain (loss) into net income | 690 | 618
Reclassification of net investment realized gain (loss) into net income, net of tax | 423 | 377
Certificates of deposit, commercial paper and money market funds |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Unrealized (losses) gains on investments, pre tax | $ 1,802 | $ (1,974)

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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities, net of securities sold in current quarter. + References No definition available. + Details
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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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