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Indebtedness - Debt Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Bank debt $ 500,000 $ 739,000
Subordinated notes 2,640,516 2,139,185
Total debt 3,140,516 2,878,185
7.25% Senior Subordinated notes due 2018
   
Debt Instrument [Line Items]    
Subordinated notes   250,000
8.00% Senior Subordinated notes due 2019
   
Debt Instrument [Line Items]    
Subordinated notes 290,516 289,185
6.75% Senior Subordinated notes due 2020
   
Debt Instrument [Line Items]    
Subordinated notes 500,000 500,000
5.75% Senior Subordinated notes due 2021
   
Debt Instrument [Line Items]    
Subordinated notes 500,000 500,000
5.00% Senior Subordinated notes due 2022
   
Debt Instrument [Line Items]    
Subordinated notes 600,000 600,000
5.00% Senior Subordinated notes due 2023
   
Debt Instrument [Line Items]    
Subordinated notes $ 750,000