Description of Business - Additional Information (Detail)	Sep. 30, 2015 USD ($) Contract	Jul. 16, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract		Apr. 29, 2013 USD ($)
Organization and Nature of Operations [Line Items]
Number of policies owned (contracts) | Contract	634		607
Life insurance estimated fair value	$ 457,810,000		$ 388,886,000
Life insurance policies with aggregate death benefit	2,997,903,000		2,931,066,000
Secured Notes, net of discount (Note 12)	0		$ 24,036,000	[1]
White Eagle | Securities Pledged as Collateral | 12.875% Senior Secured Notes Due 2017
Organization and Nature of Operations [Line Items]
Secured Notes, net of discount (Note 12)	110,000,000
White Eagle | Revolving Credit Facility
Organization and Nature of Operations [Line Items]
Revolving Credit facility, current borrowing capacity	$ 161,800,000				$ 300,000,000.0
White Eagle | Revolving Credit Facility | Securities Pledged as Collateral
Organization and Nature of Operations [Line Items]
Number of policies owned (contracts) | Contract	439
Life insurance estimated fair value	$ 327,400,000
Life insurance policies with aggregate death benefit	2,200,000,000
Revolving Credit facility, current borrowing capacity	$ 300,000,000.0				$ 300,000,000
Red Falcon Trust | Securities Pledged as Collateral
Organization and Nature of Operations [Line Items]
Number of policies owned (contracts) | Contract	157
Life insurance estimated fair value	$ 117,400,000
Life insurance policies with aggregate death benefit	604,800,000
Red Falcon Trust | Revolving Credit Facility
Organization and Nature of Operations [Line Items]
Number of policies owned (contracts) | Contract		157
Revolving Credit facility, current borrowing capacity	$ 55,200,000	$ 110,000,000
Red Falcon Trust | Revolving Credit Facility | Securities Pledged as Collateral
Organization and Nature of Operations [Line Items]
Number of policies owned (contracts) | Contract	157
Life insurance estimated fair value	$ 117,400,000
Life insurance policies with aggregate death benefit	$ 604,800,000

[1] Derived from audited consolidated financial statements.