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DEBT - Revolving Credit Facility (Detail)
9 Months Ended
Sep. 30, 2018
USD ($)
equity_cure_right
fiscal_quarter
Oct. 02, 2018
USD ($)
Jun. 29, 2018
USD ($)
Jan. 26, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Revolving credit facility borrowings $ 0       $ 0
Revolving Credit Facility | Restated Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity on line of credit     $ 600,000,000 $ 500,000,000.0  
Maximum capitalization ratio 60.00%        
Minimum consolidated tangible net worth requirement $ 1,700,000,000.0        
Revolving credit facility borrowings $ 40,000,000        
Maximum consecutive days for financial covenant 5 days        
Number of consecutive fiscal quarters in which equity cure right can be used twice (in fiscal quarter) | fiscal_quarter 4        
Maximum number of times equity cure right can be exercised | equity_cure_right 5        
AV Homes | Subsequent Event | 364 Day Term Loan Debt Facility          
Debt Instrument [Line Items]          
Revolving credit facility borrowings   $ 200,000,000      
AV Homes | Subsequent Event | Senior Convertible Notes Due 2020          
Debt Instrument [Line Items]          
Notes assumed in merger   80,000,000      
AV Homes | Subsequent Event | Senior Notes Due 2022          
Debt Instrument [Line Items]          
Notes assumed in merger   $ 400,000,000