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Fair Value of Financial Assets and Liabilities - Summary of Assets and Liabilities Recorded and Measured at Fair Value (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities $ 4,308
Total Assets 4,308
Supplemental profit sharing plan 4,266
Total Liabilities 4,266
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities 4,308
Total Assets 4,308
Supplemental profit sharing plan 0
Total Liabilities 0
Significant Other Observable Inputs (Level 2) [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities 0
Total Assets 0
Supplemental profit sharing plan 4,266
Total Liabilities 4,266
Significant Unobservable Inputs (Level 3) [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities 0
Total Assets 0
Supplemental profit sharing plan 0
Total Liabilities $ 0