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Real Estate Inventory and Land Deposits - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Real Estate [Abstract]    
Operating communities, including capitalized interest $ 2,726,828 $ 2,217,067
Real estate held for development or held for sale 217,472 294,556
Total owned inventory 2,944,300 2,511,623
Real estate not owned under option contracts 2,594 6,698
Total real estate inventory $ 2,946,894 $ 2,518,321