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Note Receivable - Related Party (Detail) - USD ($)
12 Months Ended 39 Months Ended 54 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2012
Dec. 31, 2011
Jun. 25, 2007
Notes Receivable, Related Parties, Noncurrent $ 2,644,000 $ 2,990,000       $ 3,000,000
Related Party Transaction, Rate       6.00%    
Interest Income Related Party         $ 1,000  
Debt Instrument, Decrease, Forgiveness 0          
Increase (Decrease) in Notes Receivable, Related Parties $ 63 $ 71 $ 156