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Investments in Affiliates - Operating Affiliates (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates $ 1,637,620us-gaap_EquityMethodInvestments $ 1,370,943us-gaap_EquityMethodInvestments  
Equity in net income (loss) in operating affiliates 203,034us-gaap_IncomeLossFromEquityMethodInvestments 258,195us-gaap_IncomeLossFromEquityMethodInvestments 112,391us-gaap_IncomeLossFromEquityMethodInvestments
Operating affiliates      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates 418,482us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 328,871us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Equity in net income (loss) in operating affiliates 107,218us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 119,804us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Investee summarized data - total assets 5,530,061us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 [1] 3,569,335us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Investee summarized data - total liabilities 3,792,261us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 [1] 1,981,453us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Investee summarized data - total revenue (loss) 1,655,459us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 [1] 1,716,109us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Investee summarized data - net income (loss) 628,963us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		 [1] 836,037us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherAffiliatesMember		  
Other strategic operating affiliates      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates 317,216us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 266,796us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		  
Equity in net income (loss) in operating affiliates 50,132us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 41,160us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		  
Investee summarized data - total assets 4,679,395us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1] 2,646,987us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1]  
Investee summarized data - total liabilities 3,691,173us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1] 1,888,879us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1]  
Investee summarized data - total revenue (loss) 1,075,935us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1] 902,522us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1]  
Investee summarized data - net income (loss) 152,122us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1] 125,625us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_OtherStrategicOperatingAffiliatesMember		 [1]  
Investment manager affiliates      
Schedule of Equity Method Investments [Line Items]      
Investments in affiliates 101,266us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 62,075us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [2]  
Equity in net income (loss) in operating affiliates 57,086us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 78,644us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [2]  
Investee summarized data - total assets 850,666us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1] 922,348us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1],[2]  
Investee summarized data - total liabilities 101,088us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1] 92,574us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1],[2]  
Investee summarized data - total revenue (loss) 579,524us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1] 813,587us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1],[2]  
Investee summarized data - net income (loss) $ 476,841us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1] $ 710,412us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= xlgroup_InvestmentManagerAffiliatesMember		 [1],[2]  
[1] The Company generally records its operating affiliates on a three-month lag. Estimated assets and liabilities are generally at September 30, 2014 and 2013, respectively.
[2] During the years ended December 31, 2014 and 2013, the Company received distributions from its Investment Manager Affiliates of approximately $60.3 million and $28.3 million, respectively.