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Accumulated Other Comprehensive Income - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ 335,397 | $ 296,608
Other comprehensive loss | (3,042) |
Income taxes | 641 |
Ending Balance | 343,682 | 313,174
ASU 2018-02 [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Cumulative effect adjustment from adoption of ASU 2018-02 | 938 |
Currency Translation Adjustments [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (2,386) |
Other comprehensive loss | (449) |
Ending Balance | (2,835) |
Debt Security [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 5,682 |
Other comprehensive loss | (2,593) |
Income taxes | 641 |
Ending Balance | 4,668 |
Debt Security [Member] | ASU 2018-02 [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Cumulative effect adjustment from adoption of ASU 2018-02 | 938 |
Accumulated Other Comprehensive Income [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 3,296 | 3,787
Ending Balance | 1,833 | $ 4,484
Accumulated Other Comprehensive Income [Member] | ASU 2018-02 [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Cumulative effect adjustment from adoption of ASU 2018-02 | $ 938 |

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- Definition Other comprehensive income loss tax portion attributable to unrealized gain (loss) on debt securities. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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