Accumulated Other Comprehensive Income - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
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

Other comprehensive income loss tax portion attributable to unrealized gain (loss) on debt securities.

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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.

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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.

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