Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2011 ATC International	Apr. 02, 2012 Falcon Physician Reviews	Feb. 29, 2012 Faculdade Boa Viagem	Aug. 03, 2011 American University Of Caribbean
Business Acquisition [Line Items]
Current Assets	$ 2,534	$ 670	$ 548	$ 3,901
Land, Property and Equipment	23	41	12,822	35,125
Other Long-term Assets	61
Intangible assets	4,639	2,260	19,108	131,400
Goodwill	5,010	3,699	14,092	68,321
Total Assets Acquired	12,267	6,670	46,570	238,747
Liabilities Assumed	7,513	1,288	22,323	12,844
Net Assets Acquired	$ 4,754	$ 5,382	$ 24,247	$ 225,903

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The amount of acquisition cost of a business combination allocated to assets acquired.

+ References

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to current assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

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Amount of acquisition cost of a business combination allocated to assets, excluding financial assets and goodwill, lacking physical substance.

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No definition available.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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