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Revenue Recognition - Summary of Disaggregation of Revenue by Major Source (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Tuition $ 142,196 $ 156,133
Technology fees 4,714 4,651
Other miscellaneous fees [1] 600 593
Total tuition and fees 147,510 161,377
Other revenue [2] 555 732
Total revenue 148,065 162,109
University Group [Member]    
Disaggregation Of Revenue [Line Items]    
Total revenue 147,728 148,288
University Group [Member] | CTU [Member]    
Disaggregation Of Revenue [Line Items]    
Tuition 90,734 90,205
Technology fees 2,874 2,793
Other miscellaneous fees [1] 500 496
Total tuition and fees 94,108 93,494
Other revenue [2] 499 541
Total revenue 94,607 94,035
University Group [Member] | AIU [Member]    
Disaggregation Of Revenue [Line Items]    
Tuition 51,131 52,219
Technology fees 1,840 1,858
Other miscellaneous fees [1] 100 88
Total tuition and fees 53,071 54,165
Other revenue [2] 50 88
Total revenue 53,121 54,253
All Other Campuses [Member]    
Disaggregation Of Revenue [Line Items]    
Tuition 331 13,709
Other miscellaneous fees [1]   9
Total tuition and fees 331 13,718
Other revenue [2] 6 103
Total revenue $ 337 $ 13,821
[1] Other miscellaneous fees include graduation fees, laboratory fees and activity fees.
[2] Other revenue primarily includes contract training revenue and bookstore and laptop sales.