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Fair Value of Financial Assets and Liabilities - Summary of Assets and Liabilities Recorded and Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities $ 2,281 $ 1,648
Total Assets 2,281 1,648
Supplemental profit sharing plan 5,273 4,946
Total Liabilities 5,273 4,946
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 2,281 1,648
Total Assets 2,281 1,648
Supplemental profit sharing plan 0 0
Total Liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Total Assets 0 0
Supplemental profit sharing plan 5,273 4,946
Total Liabilities 5,273 4,946
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Total Assets 0 0
Supplemental profit sharing plan 0 0
Total Liabilities $ 0 $ 0