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Stockholders' Equity - 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
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at January 1, 2018     $ 290,529    
Adjustment to beginning balance resulting from adoption of ASC 606         $ 6,671
Net loss for the nine months, ended September 30, 2018 $ (481) $ 3,727 (946) $ 6,078  
Estimated tax impact resulting from adoption of ASC 606     (1,614)    
Cash dividends declared     (7,627)    
Common stock repurchase program     (10,026)    
Amortization of stock based compensation     3,922    
Repurchase of common stock for tax withholdings     (978)    
Cumulative translation adjustment     (965)    
Issuance of common stock under the Employee Stock Purchase Plan     143    
Balance at September 30, 2018 $ 279,109   $ 279,109