XML 71 R99.htm IDEA: XBRL DOCUMENT

Reinsurance Written Premium (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Insurance Information, by Segment [Line Items]
Direct Amount									$ 1,133,336us-gaap_DirectPremiumsEarned	$ 1,069,677us-gaap_DirectPremiumsEarned	$ 972,844us-gaap_DirectPremiumsEarned
Ceded to other companies									440,656us-gaap_CededPremiumsEarned	455,985us-gaap_CededPremiumsEarned	396,639us-gaap_CededPremiumsEarned
Assumed from other companies									243,215us-gaap_AssumedPremiumsEarned	228,247us-gaap_AssumedPremiumsEarned	205,759us-gaap_AssumedPremiumsEarned
Net earned premiums	234,172us-gaap_PremiumsEarnedNet	245,367us-gaap_PremiumsEarnedNet	231,084us-gaap_PremiumsEarnedNet	225,272us-gaap_PremiumsEarnedNet	219,902us-gaap_PremiumsEarnedNet	213,895us-gaap_PremiumsEarnedNet	205,814us-gaap_PremiumsEarnedNet	202,328us-gaap_PremiumsEarnedNet	935,895us-gaap_PremiumsEarnedNet	841,939us-gaap_PremiumsEarnedNet	781,964us-gaap_PremiumsEarnedNet
Property Casualty
Supplementary Insurance Information, by Segment [Line Items]
Direct Amount									1,184,538	1,127,331	1,034,658
Ceded to other companies									432,214	482,596	452,810
Assumed from other companies									247,814	243,187	251,807
Net earned premiums									$ 1,000,138	$ 887,922	$ 833,655
Percentage of amount assumed to net									25.00%	27.00%	30.00%

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.