Summary of Information about Incurred Claims Development and Cumulative Paid Claims and Allocated Loss Adjustment Expense (ALAE), Net of Reinsurance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Claim	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Claims Development [Line Items]
Number of Reported Claims | Claim	1
U.S.Insurance | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 596,082
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	502,906
Net reserves lesser than 2007	13,112
Total Net reserves	$ 106,288
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	26.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	32.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	16.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	8.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	3.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	2.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	2.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	0.20%
U.S.Insurance | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 1,587,701
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	834,873
Net reserves lesser than 2007	16,571
Total Net reserves	$ 769,399
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	5.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	11.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	16.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	18.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	14.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	8.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	4.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	5.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	6.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	4.50%
U.S.Insurance | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 542,871
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	451,448
Net reserves lesser than 2007	(386)
Total Net reserves	$ 91,037
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	5.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	28.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	28.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	15.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	8.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	9.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	6.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	0.00%
U.S.Insurance | 2007 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 66,846	$ 66,297	$ 65,909	$ 66,024	$ 66,090	$ 65,020	$ 59,148	$ 61,216	$ 60,645	$ 52,974
Total IBNR	$ 60
Number of Reported Claims | Claim	2,737
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 64,570	64,450	63,384	62,767	62,002	58,772	49,214	40,256	28,937	9,294
U.S.Insurance | 2007 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	148,609	145,472	139,870	134,310	128,087	133,050	130,501	140,551	139,570	139,377
Total IBNR	$ 3,753
Number of Reported Claims | Claim	11,703
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 136,896	130,279	122,568	114,160	104,841	92,840	72,462	49,616	24,521	7,127
U.S.Insurance | 2007 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	59,574	59,936	60,447	60,445	61,935	62,630	57,643	55,491	38,553	38,000
Total IBNR	$ (70)
Number of Reported Claims | Claim	634
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 59,570	59,565	59,332	59,280	58,515	52,941	47,980	32,621	10,365	$ 1,861
U.S.Insurance | 2008 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	67,238	67,024	68,873	68,703	73,731	73,970	72,580	67,710	56,923
Total IBNR	$ 348
Number of Reported Claims | Claim	3,202
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 64,317	63,429	63,316	62,989	62,633	56,695	54,408	36,499	7,554
U.S.Insurance | 2008 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	157,519	152,416	147,434	143,219	141,332	140,818	144,164	158,336	158,337
Total IBNR	$ 3,971
Number of Reported Claims | Claim	10,818
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 146,463	133,064	123,945	115,526	103,804	82,028	58,491	36,713	12,178
U.S.Insurance | 2008 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	41,766	37,620	37,497	37,939	37,603	35,844	39,130	38,449	34,346
Total IBNR	$ (382)
Number of Reported Claims | Claim	770
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 42,056	37,175	35,598	35,206	34,902	30,581	25,042	15,288	$ 1,880
U.S.Insurance | 2009 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	52,169	53,091	50,905	49,762	51,804	57,266	60,813	63,769
Total IBNR	$ (186)
Number of Reported Claims | Claim	2,404
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 50,888	48,209	47,347	44,760	42,846	36,593	30,012	12,975
U.S.Insurance | 2009 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	159,110	155,682	155,156	149,975	142,416	136,700	135,984	133,394
Total IBNR	$ 7,717
Number of Reported Claims | Claim	8,434
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 145,407	138,227	132,695	119,360	92,033	59,933	36,641	14,619
U.S.Insurance | 2009 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	58,143	58,660	58,487	60,789	58,600	61,023	53,273	47,473
Total IBNR	$ (563)
Number of Reported Claims | Claim	1,370
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 58,095	57,744	53,859	55,378	51,642	41,675	21,742	3,837
U.S.Insurance | 2010 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	58,557	59,143	54,815	57,063	63,172	66,187	66,336
Total IBNR	$ (263)
Number of Reported Claims | Claim	2,164
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 57,254	54,044	50,271	45,032	41,941	33,821	17,211
U.S.Insurance | 2010 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	112,080	109,323	107,602	104,709	98,675	100,529	101,527
Total IBNR	$ 10,106
Number of Reported Claims | Claim	7,804
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 94,766	89,873	81,262	69,027	49,109	27,542	12,682
U.S.Insurance | 2010 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	85,348	86,787	74,535	75,619	68,375	64,020	52,302
Total IBNR	$ 83
Number of Reported Claims | Claim	1,429
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 84,511	82,013	59,765	54,019	46,868	23,147	2,981
U.S.Insurance | 2011 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	62,571	64,196	65,514	70,019	72,232	71,575
Total IBNR	$ 1,204
Number of Reported Claims | Claim	2,012
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 60,198	59,224	54,471	50,841	41,322	16,007
U.S.Insurance | 2011 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	105,149	95,958	95,292	92,266	85,238	86,056
Total IBNR	$ 15,964
Number of Reported Claims | Claim	6,346
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 75,806	63,800	51,868	35,551	19,548	3,925
U.S.Insurance | 2011 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	79,136	79,181	73,028	70,240	62,087	58,116
Total IBNR	$ 622
Number of Reported Claims | Claim	1,724
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 75,641	65,710	59,576	43,551	23,878	3,204
U.S.Insurance | 2012 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	71,868	70,421	73,940	91,118	87,905
Total IBNR	$ (7)
Number of Reported Claims | Claim	1,968
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 68,556	62,104	56,040	47,639	27,546
U.S.Insurance | 2012 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	111,746	103,716	98,060	96,618	111,479
Total IBNR	$ 24,895
Number of Reported Claims | Claim	4,481
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 72,495	51,980	33,477	23,019	10,013
U.S.Insurance | 2012 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	58,344	55,917	57,097	54,480	61,196
Total IBNR	$ 3,214
Number of Reported Claims | Claim	2,180
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 49,675	44,028	35,681	22,635	3,855
U.S.Insurance | 2013 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	58,148	55,494	61,289	65,132
Total IBNR	$ (619)
Number of Reported Claims | Claim	1,910
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 50,410	44,606	38,487	19,565
U.S.Insurance | 2013 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	141,817	133,068	130,314	141,728
Total IBNR	$ 29,961
Number of Reported Claims | Claim	3,533
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 85,719	49,562	21,500	7,317
U.S.Insurance | 2013 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	48,298	49,104	54,982	60,899
Total IBNR	$ 4,989
Number of Reported Claims | Claim	2,226
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 38,876	32,904	22,167	4,677
U.S.Insurance | 2014 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	48,355	49,889	67,610
Total IBNR	$ 1,509
Number of Reported Claims | Claim	1,962
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 41,609	29,916	15,702
U.S.Insurance | 2014 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	152,447	164,364	193,897
Total IBNR	$ 76,085
Number of Reported Claims | Claim	3,356
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 45,324	13,762	5,272
U.S.Insurance | 2014 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	39,826	35,870	50,020
Total IBNR	$ 6,504
Number of Reported Claims | Claim	2,278
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 29,392	14,371	2,304
U.S.Insurance | 2015 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	54,121	64,575
Total IBNR	$ 13,317
Number of Reported Claims | Claim	2,155
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 32,439	17,169
U.S.Insurance | 2015 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	224,532	251,752
Total IBNR	$ 134,029
Number of Reported Claims | Claim	3,123
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 24,291	3,641
U.S.Insurance | 2015 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	30,764	31,659
Total IBNR	$ 15,870
Number of Reported Claims | Claim	1,709
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 11,249	2,257
U.S.Insurance | 2016 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	56,209
Total IBNR	$ 32,884
Number of Reported Claims | Claim	1,824
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 12,665
U.S.Insurance | 2016 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	274,692
Total IBNR	$ 258,449
Number of Reported Claims | Claim	2,106
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 7,706
U.S.Insurance | 2016 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	41,672
Total IBNR	$ 36,356
Number of Reported Claims | Claim	1,739
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 2,383
International Insurance | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	858,751
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	671,426
Net reserves lesser than 2007	9,207
Total Net reserves	$ 196,532
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	24.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	28.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	18.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	7.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	5.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	2.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	1.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	0.80%
International Insurance | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 359,041
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	278,471
Net reserves lesser than 2007	619
Total Net reserves	$ 81,189
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	25.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	33.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	21.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	9.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	5.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	(1.00%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	(0.20%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	0.00%
International Insurance | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 186,498
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	87,901
Net reserves lesser than 2007	92
Total Net reserves	$ 98,689
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	7.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	7.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	7.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	20.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	15.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	11.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	2.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	0.80%
International Insurance | 2007 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 66,239	66,883	66,951	67,148	70,633
Total IBNR	$ (35)
Number of Reported Claims | Claim	5,585
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 63,281	62,729	61,956	60,702	59,831
International Insurance | 2007 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	25,778	25,855	25,740	25,817	26,084
Total IBNR	$ (60)
Number of Reported Claims | Claim	584
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 25,289	25,292	25,150	24,681	23,885
International Insurance | 2007 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	12,381	12,378	12,445	12,587	12,901
Total IBNR	$ (64)
Number of Reported Claims | Claim	235
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 12,382	12,277	12,269	11,704	11,293
International Insurance | 2008 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	82,752	84,191	84,131	85,285	88,720
Total IBNR	$ 98
Number of Reported Claims | Claim	5,809
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 78,683	77,535	73,746	72,309	69,959
International Insurance | 2008 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	36,729	37,296	37,867	37,884	39,504
Total IBNR	$ (75)
Number of Reported Claims | Claim	891
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 35,826	35,975	35,463	35,161	34,084
International Insurance | 2008 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	14,023	14,010	14,816	15,302	15,511
Total IBNR	$ (175)
Number of Reported Claims | Claim	365
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 14,019	13,732	13,702	13,306	12,150
International Insurance | 2009 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	79,526	82,096	84,497	86,914	89,057
Total IBNR	$ 111
Number of Reported Claims | Claim	4,969
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 75,006	74,311	70,834	68,085	64,058
International Insurance | 2009 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	25,113	25,418	25,910	25,804	26,499
Total IBNR	$ 13
Number of Reported Claims | Claim	743
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 24,369	24,286	24,713	24,257	23,371
International Insurance | 2009 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	15,780	16,289	14,972	15,367	14,809
Total IBNR	$ 629
Number of Reported Claims | Claim	445
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 14,118	13,803	12,783	10,716	8,805
International Insurance | 2010 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	108,405	111,468	114,188	119,021	123,719
Total IBNR	$ 282
Number of Reported Claims | Claim	5,317
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 99,416	97,132	93,167	87,186	74,920
International Insurance | 2010 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	38,198	39,031	39,050	39,409	39,082
Total IBNR	$ 58
Number of Reported Claims | Claim	836
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 36,601	36,509	39,017	36,499	32,156
International Insurance | 2010 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	15,619	17,451	15,661	16,159	18,603
Total IBNR	$ 1,409
Number of Reported Claims | Claim	653
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 13,366	12,632	10,460	7,169	5,801
International Insurance | 2011 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	70,751	75,873	78,872	86,795	91,347
Total IBNR	$ 25
Number of Reported Claims | Claim	4,824
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 66,538	65,580	60,879	56,569	43,740
International Insurance | 2011 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	52,202	52,666	52,093	53,654	57,463
Total IBNR	$ (198)
Number of Reported Claims | Claim	833
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 48,502	47,591	45,125	42,280	33,316
International Insurance | 2011 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	6,835	7,050	7,125	7,648	9,686
Total IBNR	$ 356
Number of Reported Claims | Claim	681
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 4,576	4,007	2,950	2,002	1,197
International Insurance | 2012 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	90,523	94,886	99,683	115,935	93,696
Total IBNR	$ (216)
Number of Reported Claims | Claim	5,201
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 79,205	76,572	68,498	52,968	22,777
International Insurance | 2012 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	27,828	28,626	30,347	30,643	34,479
Total IBNR	$ (353)
Number of Reported Claims | Claim	877
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 26,049	24,871	20,850	15,648	7,884
International Insurance | 2012 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	16,891	11,175	9,106	9,753	8,204
Total IBNR	$ 490
Number of Reported Claims | Claim	718
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 7,365	5,483	4,253	3,219	2,133
International Insurance | 2013 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	77,239	80,713	82,313	68,587
Total IBNR	$ 747
Number of Reported Claims | Claim	5,075
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 60,828	54,826	42,953	21,703
International Insurance | 2013 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	29,684	31,050	33,720	29,496
Total IBNR	$ (308)
Number of Reported Claims | Claim	1,229
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 27,180	24,735	17,613	6,829
International Insurance | 2013 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	15,402	16,272	17,628	15,096
Total IBNR	$ 4,255
Number of Reported Claims | Claim	1,053
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 9,230	2,952	2,196	725
International Insurance | 2014 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	107,789	105,072	85,512
Total IBNR	$ (1,500)
Number of Reported Claims | Claim	4,928
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 73,921	50,168	24,445
International Insurance | 2014 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	17,006	16,987	20,234
Total IBNR	$ 173
Number of Reported Claims | Claim	1,167
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 12,304	8,458	3,813
International Insurance | 2014 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	23,457	24,070	18,835
Total IBNR	$ 12,421
Number of Reported Claims | Claim	1,276
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 5,068	2,421	1,368
International Insurance | 2015 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	91,371	70,675
Total IBNR	$ 5,194
Number of Reported Claims | Claim	6,967
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 52,356	22,323
International Insurance | 2015 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	30,932	26,414
Total IBNR	$ 2,106
Number of Reported Claims | Claim	1,678
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 18,096	6,739
International Insurance | 2015 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	30,104	22,760
Total IBNR	$ 17,379
Number of Reported Claims | Claim	1,939
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 5,765	3,355
International Insurance | 2016 | Marine
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	84,156
Total IBNR	$ 26,285
Number of Reported Claims | Claim	5,577
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 22,192
International Insurance | 2016 | Property Casualty
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	75,571
Total IBNR	$ 13,006
Number of Reported Claims | Claim	2,646
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 24,255
International Insurance | 2016 | Professional Liability
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	36,006
Total IBNR	$ 31,814
Number of Reported Claims | Claim	2,554
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 2,012
Global Reinsurance
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	635,119
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	526,123
Net reserves lesser than 2007	2,598
Total Net reserves	$ 111,594
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 1	47.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 2	32.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 3	0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 4	3.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 5	8.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 6	2.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 7	2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 8	0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 9	0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance 10	(0.10%)
Global Reinsurance | 2007
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	$ 5,883	5,889	6,173	6,190	6,215
Total IBNR	$ (141)
Number of Reported Claims | Claim	254
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 5,350	5,357	5,345	5,275	5,225
Global Reinsurance | 2008
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	13,298	13,304	13,530	14,024	13,863
Total IBNR	$ 672
Number of Reported Claims | Claim	294
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 11,546	11,488	11,510	11,650	11,629
Global Reinsurance | 2009
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	10,475	10,390	10,745	11,380	11,186	3,752	3,734	$ 4,970
Total IBNR	$ 204
Number of Reported Claims | Claim	202
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 10,045	9,932	8,974	8,853	8,620	3,752	3,734
Global Reinsurance | 2010
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	12,330	11,597	12,899	13,661	13,455	3,500	3,743
Total IBNR	$ (1,000)
Number of Reported Claims | Claim	195
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 11,062	11,009	10,387	10,213	9,875	3,490	$ 0
Global Reinsurance | 2011
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	72,667	73,042	73,511	74,131	50,832	39,678
Total IBNR	$ (461)
Number of Reported Claims | Claim	766
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 72,094	71,954	71,677	71,010	43,342	$ 4,160
Global Reinsurance | 2012
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	114,728	89,053	94,766	103,183	108,790
Total IBNR	$ 531
Number of Reported Claims | Claim	1,419
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 111,681	84,533	83,183	77,077	$ 37,644
Global Reinsurance | 2013
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	104,913	101,703	119,012	112,735
Total IBNR	$ 3,973
Number of Reported Claims | Claim	1,185
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 98,271	90,567	82,558	$ 53,375
Global Reinsurance | 2014
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	121,535	141,108	120,479
Total IBNR	$ 9,825
Number of Reported Claims | Claim	920
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 105,505	119,136	$ 66,249
Global Reinsurance | 2015
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	91,098	99,874
Total IBNR	$ 11,623
Number of Reported Claims | Claim	680
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 64,316	$ 41,620
Global Reinsurance | 2016
Claims Development [Line Items]
Loss and ALAE, Net of Reinsurance	88,192
Total IBNR	$ 38,785
Number of Reported Claims | Claim	335
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 36,253