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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Shares outstanding at beginning of year 43,420,000 43,054,000 43,130,000
Shares repurchased     (464,000)
Treasury shares issued for:      
Restricted stock awards 108,000 206,000 162,000
401(k) plan   134,000 116,000
Employee stock options exercised 22,000 26,000 110,000
Shares outstanding at end of year 43,550,000 43,420,000 43,054,000