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Leases - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]      
Operating leases expiration date 2023    
Depreciation expense for continuing operations $ 67,400,000 $ 73,300,000 $ 70,800,000
Operating leases obligation 485,158,000    
Assets Under Capital Lease [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation expense for continuing operations 0   600,000
Assets recorded under capital leases from continuing operation 4,500,000    
Continuing Operations [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense, exclusive of related taxes 87,500,000 89,000,000 92,900,000
Operating leases obligation 430,831,000    
Discontinued Operations [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense, exclusive of related taxes 21,900,000 21,300,000 27,000,000
Operating leases obligation 54,327,000    
Transitional Schools [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Operating leases obligation 79,000,000    
Minimum [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Lease term range, years 5 years    
Number of renewal options for extended terms 1 year    
Maximum [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Lease term range, years 10 years    
Number of renewal options for extended terms 2 years    
Maximum [Member] | Assets Under Capital Lease [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation expense for continuing operations   $ 100,000