Legal and Other Proceedings - Additional Information (Detail)		6 Months Ended
	Apr. 07, 2015 USD ($) policy	Jun. 30, 2017 USD ($)
Subsequent Event [Line Items]
Additions to other significant pending legal or other proceedings		$ 0
Insurance Claims | Universitas Education, LLC | Pending Litigation
Subsequent Event [Line Items]
Loss contingency, number of insurance policies | policy	2
Loss contingency, insurance policy face amount	$ 30,000,000
Damages Sought | Universitas Education, LLC | Pending Litigation
Subsequent Event [Line Items]
Loss contingency, damages sought	27,000,000
Interest And Other Costs | Universitas Education, LLC | Pending Litigation
Subsequent Event [Line Items]
Loss contingency, damages sought	$ 26,000,000