Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 220,283	$ 11,661
Other comprehensive income before reclassifications	75	98,860
Amounts reclassified from accumulated other comprehensive income	(51,029)	(6,104)
Net current period other comprehensive income	(50,954)	92,756
Ending Balance	169,329	104,417
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	210,693	(41,910)
Other comprehensive income before reclassifications	33,554	94,622
Amounts reclassified from accumulated other comprehensive income	(51,002)	(5,900)
Net current period other comprehensive income	(17,448)	88,722
Ending Balance	193,245	46,812
Other Postretirement Benefit Plan, Defined Benefit [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	10,031	10,847
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	(27)	(204)
Net current period other comprehensive income	(27)	(204)
Ending Balance	10,004	10,643
Accumulated Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(441)	42,724
Other comprehensive income before reclassifications	(33,479)	4,238
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income	(33,479)	4,238
Ending Balance	$ (33,920)	$ 46,962

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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