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Financial Guarantee Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Detail) - Successor [Member] $ in Thousands	Sep. 30, 2018 USD ($)
Future premiums expected to be collected, December 31, 2018	$ 14,031
Future premiums expected to be collected, December 31, 2019	52,211
Future premiums expected to be collected, December 31, 2020	49,314
Future premiums expected to be collected, December 31, 2021	42,999
Future premiums expected to be collected, December 31, 2022	41,004
Future premiums expected to be collected, December 31, 2027	181,091
Future premiums expected to be collected, December 31, 2032	140,309
Future premiums expected to be collected, December 31, 2037	79,454
Future premiums expected to be collected, December 31, 2042	28,784
Future premiums expected to be collected, December 31, 2047	13,631
Future premiums expected to be collected, December 31, 2052	3,621
Future premiums expected to be collected, December 31, 2057	91
Future premiums expected to be collected, Total	646,540
Future expected premiums to be earned, net of reinsurance, December 31, 2018	14,672
Future expected premiums to be earned, net of reinsurance, December 31, 2019	55,831
Future expected premiums to be earned, net of reinsurance, December 31, 2020	52,205
Future expected premiums to be earned, net of reinsurance, December 31, 2021	47,630
Future expected premiums to be earned, net of reinsurance, December 31, 2022	44,441
Future expected premiums to be earned, net of reinsurance, December 31, 2027	180,584
Future expected premiums to be earned, net of reinsurance, December 31, 2032	120,582
Future expected premiums to be earned, net of reinsurance, December 31, 2037	67,135
Future expected premiums to be earned, net of reinsurance, December 31, 2042	23,960
Future expected premiums to be earned, net of reinsurance, December 31, 2047	12,632
Future expected premiums to be earned, net of reinsurance, December 31, 2052	4,647
Future expected premiums to be earned, net of reinsurance, December 31, 2057	297
Future expected premiums to be earned, net of reinsurance, Total	$ 624,616

X

- Definition

Amount of unearned premium revenue under contracts issued by an insurance entity that provide protection to the holder of a financial obligation from a financial loss in the event of a default.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fourth fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Publisher FASB
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-SubTopic 605
-Section 50
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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the eleventh through fifteenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the sixteenth through twentieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the twenty-first through twenty-fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the twenty-sixth through thirtieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the thirty-first through thirty-fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the thirty-sixth through fortieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the sixth through tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the fourth fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the eleventh through the fifteenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the sixteenth through the twentieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the twenty-first through the twenty-fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the twenty-sixth through the thirtieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the thirty-first through the thirty-fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the thirty-sixth through the fortieth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the sixth through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of premium receivables under financial guarantee insurance contracts expected to be collected in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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