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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Non-qualified savings plan assets [1] $ 2,683 $ 2,052 $ 2,079
Total 2,683 2,052 2,079
Level 1      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Non-qualified savings plan assets [1] 2,683 2,052 2,079
Total $ 2,683 $ 2,052 $ 2,079
[1] The non-qualified savings plan assets are included in “Other receivables and prepaid expenses” in the Company’s consolidated balance sheets and have an offsetting liability of equal amount, which is included in “Accounts payable and accrued expenses” in the Company’s consolidated balance sheets.