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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Ambac Rating |  |
Notional outstanding | $ 455,792 | $ 737,380
Other Derivatives [Member] |  |
Ambac Rating |  |
Notional outstanding | 455,792 | 737,380
Other Derivatives [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
Other Derivatives [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 240,850 | 315,201
Other Derivatives [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 227,146
Other Derivatives [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 142,750 | 127,250
Other Derivatives [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 72,192 | $ 67,783

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- 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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