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Real Estate Inventories - Summary of Interest Incurred, Capitalized and Expensed (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Real Estate [Abstract]        
Interest incurred $ 23,942 $ 22,865 $ 67,089 $ 61,669
Interest capitalized (23,942) (22,865) (67,089) (61,669)
Interest expensed 0 0 0 0
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]        
Capitalized interest in beginning inventory 185,589 173,261 176,348 157,329
Interest capitalized as a cost of inventory 23,942 22,865 67,089 61,669
Interest previously capitalized as a cost of inventory, included in cost of sales (20,293) (15,899) (54,199) (38,771)
Capitalized interest in ending inventory $ 189,238 $ 180,227 $ 189,238 $ 180,227