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Legal and Other Proceedings - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Feb. 27, 2018
Sep. 30, 2018
Dec. 31, 2019
Mar. 31, 2017
Loss Contingencies [Line Items]        
Additions to other significant pending legal or other proceedings     $ 0  
Settled Litigation | Universitas Education, LLC        
Loss Contingencies [Line Items]        
Loss to legal settlement $ 12,000,000.0      
Recovery from legal settlement   $ 7,900,000    
Pending Litigation | NHT        
Loss Contingencies [Line Items]        
Face amount of life settlement policies       $ 6,300,000