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Dispositions - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 03, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2013
International Segment Sale [Member]
Dec. 31, 2013
International Segment Sale [Member]
Dec. 31, 2013
AIU London [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Total consideration to purchase agreement $ 305,000,000            
Cash payment after pre-closing distributions and adjustments 276,500,000            
Realized gain on sale       130,100,000 130,100,000    
Transaction costs       8,900,000      
Cumulative translation adjustments       10,000,000   6,700,000 3,300,000
Income tax expense   39,900,000   87,900,000      
Fair market value       0      
Loss on pending sale of business     $ 6,700,000 $ (6,905,000)