Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - Successor [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 15,215	$ 220,283
Other comprehensive income before reclassifications	(35,709)	(176,434)
Amounts reclassified from accumulated other comprehensive income	(18,496)	(28,634)
Net current period other comprehensive income	(54,205)	(205,068)
Ending Balance	(38,990)	15,215
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	50,963	210,693
Other comprehensive income before reclassifications	85,378	(131,976)
Amounts reclassified from accumulated other comprehensive income	(17,478)	(27,754)
Net current period other comprehensive income	67,900	(159,730)
Ending Balance	118,863	50,963
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	9,344	10,031
Other comprehensive income before reclassifications	1,041	193
Amounts reclassified from accumulated other comprehensive income	(1,018)	(880)
Net current period other comprehensive income	23	(687)
Ending Balance	9,367	9,344
Accumulated Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(45,092)	(441)
Other comprehensive income before reclassifications	(122,128)	(44,651)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income	(122,128)	(44,651)
Ending Balance	$ (167,220)	$ (45,092)