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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Beginning Balance $ 497,911  
Net income (10,814) $ 6,651
Dividend payments (4,367)  
Dividends accrued for unvested restricted stock units (2)  
Net unrealized gains (losses) on available-for-sale securities (3,412) 1,335
Defined benefit plan adjustments (net of tax) 62 55
Foreign currency translation adjustment 842 1,242
Proceeds from stock option exercises 369 $ 1,377
Purchase of treasury stock (10,171)  
Adoption of new accounting standards (see note 1) 3,499  
Stock-based compensation expense 1,819  
Ending Balance $ 475,736