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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for doubtful accounts $ 1,685 $ 2,362
Share-based compensation 4,201 7,681
Deferred tuition revenue 1,294 1,539
Deferred scholarship 618 1,198
Deferred rent 54 122
Intangibles 590 1,048
State taxes 985 1,228
Other 1,422 2,731
Deferred tax assets 10,849 17,909
Deferred tax liability:    
Property and equipment (28,028) (40,358)
Other (1,183) (1,259)
Deferred tax liability (29,211) (41,617)
Net deferred tax liability $ (18,362) $ (23,708)