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Notes Payable - Notes Payable Related Parties (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Note payable $ 41,519
JCH Crenshaw Holdings LLC [Member]  
Debt Instrument [Line Items]  
Note payable 9,303
Casey and Stacey Crenshaw [member]  
Debt Instrument [Line Items]  
Note payable 5,814
Crenshaw Family Holdings LP [member]  
Debt Instrument [Line Items]  
Note payable 11,983
The Modern Group Ltd [member]  
Debt Instrument [Line Items]  
Note payable $ 14,419