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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Weighted average number of common shares outstanding 65,592 65,988 65,909 65,771
Director Plan and deferred stock units 212 201 221 204
ESOP 108 72 92 76
Common shares outstanding—basic 65,912 66,261 66,222 66,051
Dilutive effect of Option Plans and Omnibus Plan 1,456 2,067 1,559 2,074
Common and potential common shares outstanding—diluted 67,368 68,328 67,781 68,125