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Investments - Summary of Net Investment Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investment [Line Items]
Fixed income securities	$ 59,426	$ 65,585
Short-term investments	553	42
Loans	106	132
Investment expense	(2,103)	(2,427)
Securities available-for-sale and short-term	57,982	63,332
Other investments	2,839	9,651
Total net investment income	60,821	72,983
Gains (losses) on securities held as of reporting date [Member]
Investment [Line Items]
Net Realized and Unrealized Gain (Loss) on Trading Securities	1,707	7,819
Trading Securities, Realized Gain (Loss)	406	1,564
Other investments	$ 1,301	$ 6,255

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Article 12
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-URI http://asc.fasb.org/extlink&oid=6505594

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