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Investments - Summary of Net Investment Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investment [Line Items]
Fixed income securities	$ 67,293	$ 84,339	$ 197,506	$ 233,878
Short-term investments	85	832	186	2,000
Loans	113	123	338	415
Investment expense	(1,872)	(2,413)	(6,801)	(7,723)
Securities available-for-sale and short-term	65,619	82,881	191,229	228,570
Other investments	(1,424)	700	10,702	5,905
Total net investment income	64,195	83,581	201,931	234,475
Gains (losses) on securities held as of reporting date [Member]
Investment [Line Items]
Net Realized and Unrealized Gain (Loss) on Trading Securities	(2,549)	329	7,493	5,534
Trading Securities, Realized Gain (Loss)	933	0	7,534	(431)
Other investments	$ (3,482)	$ 329	$ (41)	$ 5,965

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

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