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Notes Payable - Schedule Notes Payable (Parenthetical) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Debt instrument maturity Date Aug. 31, 2024
Secured Variable Rate One Month Libor Plus Three Percent At The End Of Each Month [member]  
Debt Instrument [Line Items]  
Long term debt, basis spread on variable rate 3.00%
Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt instrument principal payment $ 19.0
Equity interest on secure debt $ 20.0