Discontinued Operations - Combined Summary Results Of Operations For Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue			$ 2,904		$ 5		$ 26,881
(Loss) income before income tax	(3,107)		(5,275)		(4,500)		1,290
Income tax (benefit) provision (1)	(792)	[1]	(1,841)	[1]	(1,461)	[1]	350	[1]
(LOSS) INCOME FROM DISCONTINUED OPERATIONS, net of tax	$ (2,315)		$ (3,434)		$ (3,039)		$ 940

[1] Amount represents the difference between the total consolidated income tax (benefit) provision, calculated by applying the estimated full-year consolidated effective tax rate to (losses) / earnings reported for the period, and the income tax (benefit) provision for continuing operations, calculated by applying the estimated full-year effective tax rate for continuing operations to pretax (loss) income from continuing operations for the period.