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Goodwill and Other Intangible Assets - Schedule of Net Book Value of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets Net Excluding Goodwill [Line Items]    
Net book value, non-amortizable intangible assets $ 7,900 $ 7,900
Accreditation Rights [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Net book value, non-amortizable intangible assets 1,000 1,000
CTU Trade Name [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Net book value, non-amortizable intangible assets $ 6,900 $ 6,900