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Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2007
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative cash receipts received under ECU earn-out						$ 150,000
Payments received under 5CP earn-out			12,284	11,369
Cash transaction bonus payable				1,137	1,228
Total payments received under the 5CP earn-out				66,360
Excess cash received under 5CP earn-out				33,259
Pretax earnings(loss)from results	(2,283)	(4,068)		(6,360)	(481)
Pretax gains from discontinued operations related to insurance settlements					$ 7,500

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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