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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Weighted Average Number of Shares Outstanding [Line Items]        
Weighted average number of common shares outstanding 68,536 68,507 68,445 68,342
Director Plan and deferred stock units 233 338 287 348
ESOP 98 109 98 105
Common shares outstanding—basic 68,867 68,954 68,830 68,795
Common and potential common shares outstanding—diluted 70,755 71,161 70,759 70,993
Option plans and Omnibus Plan
       
Weighted Average Number of Shares Outstanding [Line Items]        
Dilutive effect of Option Plans and Omnibus Plan 1,888 2,207 1,929 2,198