Related Party Transactions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 18, 2014 HCP Stockholders [Member]	Mar. 31, 2014 Jefferies [Member]	Dec. 13, 2013 FGL [Member]	Mar. 31, 2014 Preferred Stock [Member] HCP Stockholders [Member]	Mar. 18, 2014 Preferred Stock [Member] HCP Stockholders [Member]	Mar. 31, 2014 Maximum [Member] Leucadia [Member]	Mar. 31, 2014 Limitation of Sale of Common Stock [Member] Maximum [Member] Leucadia [Member]
Related Party Transaction [Line Items]
Expenses related to Services Agreement	$ 1.5	$ 1.2	$ 2.9	$ 1.4
Stock Issued During Period, Shares, Acquisitions								23,000,000
Share Price									$ 11
Stock Issued During Period, Value, Acquisitions								253.0
Common Stock, Shares, Issued					23,000,000
Percentage Of Beneficial Ownership										27.50%	4.90%
Shares Offered To Public In Initial Offering							9,750,000
Shares Offered To Underwriters In Initial Offering							1,463,000
Sale of Stock, Price Per Share							$ 17
Expense Related to Distribution or Servicing and Underwriting Fees						$ 12.9