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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - Other Credit Derivatives [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Ambac Rating
Notional outstanding	$ 295,342	$ 325,890
AAA Rating [Member]
Ambac Rating
Notional outstanding	0	0
AA Rating [Member]
Ambac Rating
Notional outstanding	295,342	175,765
A Rating [Member]
Ambac Rating
Notional outstanding	0	0
BBB Rating [Member]
Ambac Rating
Notional outstanding	0	150,125
Below Investment Grade Rating [Member]
Ambac Rating
Notional outstanding	$ 0	$ 0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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