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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Weighted Average Number of Shares Outstanding [Line Items]        
Weighted average number of common shares outstanding 65,769 68,536 65,663 68,445
Director Plan and deferred stock units 209 233 205 287
ESOP 82 98 78 98
Common shares outstanding—basic 66,060 68,867 65,946 68,830
Common and potential common shares outstanding—diluted 68,088 70,755 68,023 70,759
Option Plans And Omnibus Plan [Member]
       
Weighted Average Number of Shares Outstanding [Line Items]        
Dilutive effect of Option Plans and Omnibus Plan 2,028 1,888 2,077 1,929