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Stockholders' Equity - Stockholders' Equity (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Common Stock, Beginning balance 29,554,500 29,554,500 29,555,000
Treasury Stock, Beginning balance 5,263,000 5,208,000 6,222,000
Exercise of options, Common Stock 0 0 0
Exercise of options, Treasury Stock (152,000) (105,000) (632,000)
Acquisition-related stock issued, Common Stock 0 0 0
Acquisition-related stock issued, Treasury Stock 0 0 (471,000)
Stock purchases, Common Stock 0 0 0
Stock purchases, Treasury Stock 342,000 160,000 89,000
Common Stock, Ending balance 29,554,500 29,554,500 29,554,500
Ending balance, Treasury Stock 5,453,000 5,263,000 5,208,000