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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Weighted Average Number of Shares Outstanding [Line Items]        
Weighted average number of common shares outstanding 65,988 68,910 65,771 68,600
Director Plan and deferred stock units 201 196 204 257
ESOP 72 73 76 89
Common shares outstanding—basic 66,261 69,179 66,051 68,946
Common and potential common shares outstanding—diluted 68,328 71,186 68,125 70,901
Option Plans And Omnibus Plan [Member]
       
Weighted Average Number of Shares Outstanding [Line Items]        
Dilutive effect of Option Plans and Omnibus Plan 2,067 2,007 2,074 1,955