XML 65 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivative Instruments - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 11,000 $ (151,000) $ (372,000)
Other Assets [Member]      
Derivative [Line Items]      
Fair values of interest rate corridor instrument 509,000 490,000  
Interest Rate Corridor [Member]      
Derivative [Line Items]      
Notional amount of derivative instrument $ 66,667    
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 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 $ 17,000 $ 245,000 $ 602,000