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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Beginning Balance			$ 497,911
Net Income (Loss)	$ 7,589	$ 15,898	(10,895)	$ 34,950
Dividend payments			(12,976)
Dividends accrued for unvested restricted stock units			(15)
Net unrealized gains (losses) on available-for-sale securities	(32)	804	(3,340)	2,512
Defined benefit plan adjustments (net of tax)	37	73	104	214
Foreign currency translation adjustment	(451)	$ 1,541	(3,033)	5,402
Proceeds from stock option exercises			1,321	$ 6,606
Purchase of treasury stock			(14,185)
Adoption of new accounting standards (see Note 1)			3,499
Stock-based compensation expense			5,243
RSU's and restricted stock vested			(33)
Ending Balance	$ 463,601		$ 463,601

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Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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