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Fair Value Disclosures - Summary of Nonfinancial Assets Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Real estate inventory impairments $ 0 $ 854,000 $ 0  
Real estate inventories 3,216,059,000 3,105,553,000   $ 3,056,236,000
Fair Value Measurements Nonrecurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Real estate inventory impairments 0 854,000    
Real estate inventories $ 0 $ 12,950,000