DERIVATIVE INSTRUMENTS (Detail) - Summary of financial operations derivatives credit exposure (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Total liability recorded	$ 15,763	$ 25,887
Underlying obligations average credit rating	BB-	BB
Structured Finance [Member]
Principal outstanding	78,425	226,429
Interest outstanding	3,253	19,863
Aggregate outstanding exposure	81,678	246,292
Total liability recorded	$ 10,288	$ 25,887
Weighted average contractual term to maturity	4.6 years	5.3 years
Underlying obligations average credit rating	BB	B-

This element represents the amount of insured contractual payments outstanding on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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This element represents the amount of insured contractual payments outstanding attributable to interest accrued on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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- Definition

This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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