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Variable Interests (Detail)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
joint_venture
subsidiary
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]        
Number of wholly-owned unconsolidated subsidiaries | subsidiary   3    
Repayments of debt   $ 30,928 $ 0  
Number of interests in consolidated VIE joint ventures | joint_venture   0    
Notes payable to Trusts | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Repayments of debt $ 30,928     $ 88,662
Notes payable to Trusts       $ 30,928