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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Number of Shares Outstanding [Line Items]      
Weighted average number of common shares outstanding 65,719 65,904 68,209
Director Plan and deferred stock units 210 196 242
ESOP 91 75 84
Common shares outstanding—basic 66,020 66,175 68,535
Common and potential common shares outstanding—diluted 67,484 68,229 70,546
Restricted Stock      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 255 359 228
Stock Options [Member]      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 1,209 1,695 1,783