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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Jun. 30, 2012
Health Education [Member]
Jun. 30, 2012
Health Education [Member]
Dec. 31, 2012
Health Education [Member]
Dec. 31, 2011
Health Education [Member]
Jun. 30, 2012
Design & Technology [Member]
Dec. 31, 2012
Design & Technology [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2011
Transitional Schools [Member]
Impairment Charges [Line Items]                                    
Goodwill impairment     $ 83,350,000 $ 168,697,000             $ 41,900,000 $ 41,871,000 $ 64,626,000 $ 41,500,000 $ 40,752,000 $ 700,000 $ 727,000 $ 30,113,000
Goodwill impairment for tax deductible purpose   9,800,000                                
Indefinite lived intangible assets impairment charges 12,100,000                 1,000,000                
Goodwill in connection with the acquisition 2,900,000   2,900,000                              
Amount of bargain purchase gain     700,000                              
Estimated useful lives of intangible assets, in years             1 year   15 years                  
Amortization expense from continuing operations     $ 1,600,000 $ 5,800,000 $ 900,000                          
Determining fair value discount rates 30.00%                                  
Royalty rates           1.00%   5.00%                    
Fair value terminal growth rates 3.00%