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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 497,911
Other comprehensive income (loss) before reclassifications	585	$ 2,941
Amounts reclassified from accumulated other comprehensive income	127	(230)
Amounts reclassified to retained earnings	(3,220)
Other Comprehensive Income (Loss), net of tax	(2,508)	2,711
Ending Balance	475,736
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,567	404
Other comprehensive income (loss) before reclassifications	(257)	1,620
Amounts reclassified from accumulated other comprehensive income	65	(285)
Amounts reclassified to retained earnings	(3,220)
Other Comprehensive Income (Loss), net of tax	(3,412)	1,335
Ending Balance	(845)	1,739
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications		79
Other Comprehensive Income (Loss), net of tax		79
Ending Balance		79
Defined Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4,286)	(5,017)
Amounts reclassified from accumulated other comprehensive income	62	55
Other Comprehensive Income (Loss), net of tax	62	55
Ending Balance	(4,224)	(4,962)
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,576)	(7,575)
Other comprehensive income (loss) before reclassifications	842	1,242
Other Comprehensive Income (Loss), net of tax	842	1,242
Ending Balance	(734)	(6,333)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,295)	(12,188)
Ending Balance	$ (5,803)	$ (9,477)

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

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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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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