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Share-Based Compensation (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Feb. 26, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option vesting period in years 3 years  
Stock option term in years 10 years  
Restricted stock award and units vesting period in years 4 years  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted   1,891,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted-average grant date fair value for stock options granted   $ 18.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards granted to employees and officers of the company   1,278,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Grant date fair value of awards except for options granted to employees and officers of the company   $ 114.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units awarded to employees and officers of the company   290,475ace_RestrictedStockUnitsIssuedToOfficersDuringPeriodSharesRestrictedStockAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Grant date fair value of awards except for options granted to employees and officers of the company   $ 114.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember