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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 06, 2013 Petition | Aug. 17, 2012 Motion | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 12, 2013 Ambac [Member] | Dec. 12, 2013 Ambac Assurance [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |
Rent expense |  |  | $ 5,293 | $ 4,685 |  |
Number of petitions filed | 2 |  |  |  |  |
Number of motions filed by rehabilitator |  | 2 |  |  |  |
Bonds redeemed |  |  |  |  | 2,700 |
Ambac Assurance's payment under a swap termination surety bond |  |  |  |  |  | $ 800,000

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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