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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain other investments accounted for at cost $ 4,400 $ 4,400
Borrowings under credit facility 110,000 150,000
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Borrowings under credit facility 110,000  
Israeli Severance Arrangements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying value of assets related to deposits $ 1,300 $ 1,400