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Share Capital - Schedule of Common Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Capitalization Equity [Line Items]    
Beginning balance, Shares 119,909,016us-gaap_CommonStockSharesOutstanding 121,540,562us-gaap_CommonStockSharesOutstanding
Issued on exercise of stock options, Shares 423,031us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 205,254us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Issued on sale of shares under Employee Share Purchase Plan, Shares 65,600us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 66,400us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Repurchased under normal course issuer bid, Shares (150,000)us-gaap_StockRepurchasedDuringPeriodShares (1,903,200)us-gaap_StockRepurchasedDuringPeriodShares
Ending balance, Shares 120,247,647us-gaap_CommonStockSharesOutstanding 119,909,016us-gaap_CommonStockSharesOutstanding
Beginning balance $ 425,238us-gaap_CommonStockValue $ 431,067us-gaap_CommonStockValue
Issued on exercise of stock options 759us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 478us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Transfer from additional paid-in capital on exercise of options 401us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions 243us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions
Issued on sale of shares under Employee Share Purchase Plan 171us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan 196us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Repurchased under normal course issuer bid (472)us-gaap_StockRepurchasedDuringPeriodValue (7,134)us-gaap_StockRepurchasedDuringPeriodValue
Ending balance 426,037us-gaap_CommonStockValue 425,238us-gaap_CommonStockValue
Capital Stock [Member]    
Schedule Of Capitalization Equity [Line Items]    
Repurchased under normal course issuer bid, Shares (150,000)us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(1,903,200)us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issued on exercise of stock options 1,160us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
721us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issued on sale of shares under Employee Share Purchase Plan 171us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
196us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Repurchased under normal course issuer bid $ (532)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (6,746)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember