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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Shares Outstanding      
Shares outstanding at beginning of year 42,784,000 42,650,000 45,976,000
Shares repurchased (291,120) (374,000) (3,505,000)
Treasury shares issued for:      
Restricted stock awards 86,000 76,000 14,000
401(k) plan 123,000 152,000 143,000
Director compensation     12,000
Employee stock options exercised 137,000 280,000 10,000
Shares outstanding at end of year 43,130,000 42,784,000 42,650,000