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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]      
Operating leases expiration date 2028    
Operating leases obligation $ 106,479    
Continuing Operation [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense, including charges for vacated space, exclusive of related taxes 28,100 $ 70,400 $ 64,300
Operating leases obligation 99,855    
All Other Campuses [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Operating leases obligation $ 40,300    
Minimum [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Lease term range, years 1 year    
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