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Related Party Transactions - Additional Information (Detail) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Leucadia [Member]
Jun. 30, 2014
Jefferies [Member]
Dec. 13, 2013
FGL [Member]
Jun. 30, 2014
Preferred Stock [Member]
HCP Stockholders [Member]
Mar. 18, 2014
Preferred Stock [Member]
HCP Stockholders [Member]
Jun. 30, 2014
Maximum [Member]
Leucadia [Member]
Jun. 30, 2014
Limitation of Sale of Common Stock [Member]
Maximum [Member]
Leucadia [Member]
Related Party Transaction [Line Items]                      
Expenses related to Services Agreement $ 1,500,000 $ 1,600,000 $ 4,400,000 $ 3,000,000              
Stock Issued During Period, Shares, Acquisitions               23,000      
Share Price                 $ 11    
Stock Issued During Period, Value, Acquisitions               253,000,000      
Percentage Of Beneficial Ownership                   27.50% 4.90%
Shares Offered To Public In Initial Offering             9,750        
Shares Offered To Underwriters In Initial Offering             1,463        
Sale of Stock, Price Per Share             $ 17        
Expense Related to Distribution or Servicing and Underwriting Fees           12,900,000          
Available-for-sale Securities, Debt Securities         $ 37.3