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Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Beginning Balance $ 151,600 $ 141,189
Issuance of common stock under stock plans 3,275 2,463
Cumulative effect adjustment due to adoption of new accounting pronouncements   3,803
Stock-based compensation expense 2,685 1,963
Repurchases of common stock   (4,367)
Dividends paid on common shares   (3,611)
Net loss (13,316) (1,733)
Net change in marketable investments, net of tax   (115)
Foreign currency translation (430) 1,703
Ending Balance 143,814 141,295
Common Stock [Member]    
Beginning Balance $ 230 $ 224
Beginning Balance, Shares 22,951 22,432
Issuance of common stock under stock plans $ 1 $ 1
Issuance of common stock under stock plans, Shares 99 82
Ending Balance $ 231 $ 225
Ending Balance, Shares 23,050 22,514
Additional Paid-in Capital [Member]    
Beginning Balance $ 200,696 $ 181,910
Issuance of common stock under stock plans 3,274 2,462
Stock-based compensation expense 2,685 1,963
Ending Balance 206,655 186,335
Retained Earnings [Member]    
Beginning Balance 127,717 123,010
Cumulative effect adjustment due to adoption of new accounting pronouncements   3,829
Dividends paid on common shares   (3,611)
Net loss (13,316) (1,733)
Ending Balance 114,401 121,495
Treasury Stock [Member]    
Beginning Balance $ (171,889) $ (161,943)
Beginning Balance, Shares 4,631 4,391
Repurchases of common stock   $ (4,367)
Repurchase of common stock, Shares   (106)
Ending Balance $ (171,889) $ (166,310)
Ending Balance, Shares 4,631 4,497
Accumulated Other Comprehensive Income (Loss) [Member]    
Beginning Balance $ (5,154) $ (2,012)
Cumulative effect adjustment due to adoption of new accounting pronouncements   (26)
Net change in marketable investments, net of tax   (115)
Foreign currency translation (430) 1,703
Ending Balance $ (5,584) $ (450)