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Nature of Business and Summary of Significant Accounting Policies (Other Comprehensive Income) - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 497,911	$ 479,517	$ 480,160
Other comprehensive income (loss) before reclassifications	(7,441)	10,851	(283)
Amounts reclassified to retained earnings	(3,220)
Amounts reclassified from accumulated other comprehensive income	(460)	(1,958)	(2,936)
Ending Balance	446,279	497,911	479,517
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,567	404	1,932
Other comprehensive income (loss) before reclassifications	685	5,020	1,515
Amounts reclassified to retained earnings	(3,220)
Amounts reclassified from accumulated other comprehensive income	(595)	(2,857)	(3,043)
Ending Balance	(563)	2,567	404
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications		(619)
Amounts reclassified from accumulated other comprehensive income		619
Defined Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4,286)	(5,017)	(3,895)
Other comprehensive income (loss) before reclassifications	(3,890)	451	(1,229)
Amounts reclassified from accumulated other comprehensive income	135	280	107
Ending Balance	(8,041)	(4,286)	(5,017)
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,576)	(7,575)	(7,006)
Other comprehensive income (loss) before reclassifications	(4,236)	5,999	(569)
Ending Balance	(5,812)	(1,576)	(7,575)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,295)	(12,188)	(8,969)
Ending Balance	$ (14,416)	$ (3,295)	$ (12,188)

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