Acquired Intangible Assets Subject to Amortization and Values and Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
Apr. 30, 2011 ATC International	Apr. 30, 2011 ATC International Customer Relationships	Apr. 30, 2011 ATC International Curriculum and Course Materials	Apr. 30, 2011 ATC International Tradenames and Trademarks	Apr. 30, 2011 ATC International Non-Compete Agreements 1	Apr. 30, 2011 ATC International Non-Compete Agreements 2	Aug. 03, 2011 American University Of Caribbean Student Relationships	Feb. 29, 2012 Faculdade Boa Viagem Student Relationships	Feb. 29, 2012 Faculdade Boa Viagem Curriculum/Software	Apr. 02, 2012 Falcon Physician Reviews	Apr. 02, 2012 Falcon Physician Reviews Customer Relationships	Apr. 02, 2012 Falcon Physician Reviews Curriculum/Software	Apr. 02, 2012 Falcon Physician Reviews Trade Names	Apr. 02, 2012 Falcon Physician Reviews Noncompete Agreements
Business Acquisition [Line Items]
Amortizable intangible assets		$ 3,230	$ 1,071	$ 140	$ 116	$ 82	$ 14,300	$ 3,174	$ 133		$ 400	$ 870	$ 50	$ 940
Amortizable intangible assets, estimated useful lives	9 years 6 months	12 years	5 years	2 years	2 years	6 months	4 years	6 years	2 years	5 years 9 months 18 days	10 years	5 years	1 year 6 months	5 years

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant