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Shareholders' Equity - Reconciliation of Weighted Average Number of Shares (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Number of Shares Outstanding [Line Items]      
Weighted average number of common shares outstanding 64,033 65,719 65,904
Director Plan and deferred stock units 162 210 196
ESOP 101 91 75
Common shares outstanding—basic 64,296 66,020 66,175
Common and potential common shares outstanding—diluted 65,158 67,484 68,229
Restricted Stock      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 150 255 359
Stock Options [Member]      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 712 1,209 1,695