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Stockholders' Equity - Stockholders' Equity (Detail) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Common Stock, Beginning balance 29,554,500 29,554,500 29,554,500
Exercise of options, Common Stock 0 0 0
Stock purchases, Common Stock 0 0 0
Common Stock, Ending balance 29,554,500 29,554,500 29,554,500
Treasury Stock, Beginning balance 5,483,341 5,453,000 5,263,000
Exercise of options, Treasury Stock (296,000) (152,000) (152,000)
Stock purchases, Treasury Stock 17,000 182,000 342,000
Ending balance, Treasury Stock 5,204,181 5,483,341 5,453,000