Derivative Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Period of LIBOR interest rate	30 days
Effective portion of gain/loss on derivatives included as a component of other comprehensive income, net of taxes	$ (151,000)	$ (372,000)	$ (300,000)
Other Assets [Member]
Derivative [Line Items]
Fair values of interest rate corridor instrument	490,000	728,000
Interest Rate Corridor [Member]
Derivative [Line Items]
Notional amount of derivative instrument	$ 73,333
Description of interest rate risk hedge at several thresholds	The University pays variable interest monthly based on the 30-day LIBOR rates until that index reaches 1.5%. If 30-dayLIBOR is equal to 1.5% through 3.0%, the University pays 1.5%. If 30-day LIBOR exceeds 3.0%, the University pays actual 30-day LIBOR less 1.5%.
Interest expense on derivatives related to credit risk	$ 2,000
Interest Rate Corridor [Member] | LIBOR [Member]
Derivative [Line Items]
Maximum percentage of variable interest rates based on LIBOR	1.50%
Percentage of amount paid by University	1.50%
Percentage deducted from LIBOR for actual payment	1.50%
Interest Rate Corridor [Member] | LIBOR [Member] | Minimum [Member]
Derivative [Line Items]
Percentage of LIBOR	1.50%
Interest Rate Corridor [Member] | LIBOR [Member] | Maximum [Member]
Derivative [Line Items]
Percentage of LIBOR	3.00%
Cash Flow Hedging [Member]
Derivative [Line Items]
Effective portion of gain/loss on derivatives included as a component of other comprehensive income, net of taxes	$ 245,000	$ 602,000	$ 486,000