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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted Average Number of Shares Outstanding [Line Items]      
Weighted average number of common shares outstanding 65,904us-gaap_WeightedAverageNumberOfSharesIssuedBasic 68,209us-gaap_WeightedAverageNumberOfSharesIssuedBasic 68,409us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Director Plan and deferred stock units 196us-gaap_WeightedAverageNumberOfSharesRestrictedStock 242us-gaap_WeightedAverageNumberOfSharesRestrictedStock 341us-gaap_WeightedAverageNumberOfSharesRestrictedStock
ESOP 75us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased 84us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased 99us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased
Common shares outstanding—basic 66,175us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 68,535us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 68,849us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common and potential common shares outstanding—diluted 68,229us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 70,546us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 71,005us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Restricted Stock      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 359us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
228us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
181us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Stock Options [Member]      
Weighted Average Number of Shares Outstanding [Line Items]      
Dilutive effect of stock awards 1,695us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,783us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,975us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember