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Note Receivable - Related Party (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 25, 2007
Notes Receivable, Related Parties, Noncurrent $ 1,927,000 $ 2,289,000   $ 3,000,000
Debt Instrument, Decrease, Forgiveness 0      
Increase (Decrease) in Notes Receivable, Related Parties $ 47 $ 55 $ 63