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Discontinued Operations - Summary of Revenues and Pretax Profits (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues And Results Of Operations Of Discontinued Operations [Abstract]
Net service revenues	$ 8,723	$ 19,696	$ 56,670	$ 57,301
Income from discontinued operations, before income taxes	$ 95,917	$ 2,242	$ 103,512	$ 6,697

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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