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Schedule IV - Reinsurance (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount $ 1,331,597 $ 1,298,864 $ 1,266,264
Ceded to other companies 1,338,427 [1] 1,305,648 [1] 1,273,321 [1]
Assumed from other companies 6,830 6,784 7,057
Net amount         
Percentage of amount assumed to net         
Gross amount 389,941,404 378,467,115 364,469,564
Ceded to other companies 395,421,202 [1] 384,205,939 [1] 370,439,179 [1]
Assumed from other companies 5,479,798 5,738,824 5,969,615
Net amount         
Percentage of amount assumed to net         
Life and annuities
     
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount 1,250,623 1,201,592 1,156,434
Ceded to other companies 1,257,453 [1] 1,208,376 [1] 1,163,491 [1]
Assumed from other companies 6,830 6,784 7,057
Net amount         
Percentage of amount assumed to net         
Accident And Health Insurance
     
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount 80,974 97,272 109,830
Ceded to other companies 80,974 [1] 97,272 [1] 109,830 [1]
Net amount         
Percentage of amount assumed to net         
[1] No reinsurance or coinsurance income was netted against premiums ceded in 2013, 2012 or 2011.