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Debt - Senior Unsecured Credit Facility (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]          
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent)     50.00%    
Net proceeds from future equity issuances (as a percent)     75.00%    
Unsecured credit facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity (up to) $ 300,000,000   $ 300,000,000    
Increase in credit facility 600,000,000   600,000,000    
Senior unsecured credit facility 0   0   $ 0
Interest and unused credit facility fees $ 200,000 $ 200,000 $ 700,000 $ 1,100,000  
Minimum          
Line of Credit Facility [Line Items]          
Line of credit facility, unused capacity, commitment fee (as a percent)     0.20%    
Maximum          
Line of Credit Facility [Line Items]          
Line of credit facility, unused capacity, commitment fee (as a percent)     0.30%    
Line Of Credit Facility Covenant Actual Results          
Line of Credit Facility [Line Items]          
Maximum leverage ratio (as a percent) 0.244   0.244    
Minimum fixed charge coverage ratio     4.46    
Minimum tangible net worth $ 2,570,000,000   $ 2,570,000,000    
Secured recourse indebtedness ratio     21.20%    
Line Of Credit Facility Covenant          
Line of Credit Facility [Line Items]          
Maximum leverage ratio (as a percent) 0.60   0.60    
Minimum fixed charge coverage ratio     1.5    
Minimum tangible net worth $ 1,913,306,000   $ 1,913,306,000    
Secured recourse indebtedness ratio     45.00%    
LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     150.00%    
LIBOR | Minimum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.75%    
LIBOR | Maximum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     2.75%    
Less than or equal to 35% | Maximum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.35    
Less than or equal to 35% | LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.50%    
Greater than 35% but less than or equal to 45% | Minimum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.35    
Greater than 35% but less than or equal to 45% | Maximum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.45    
Greater than 35% but less than or equal to 45% | LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.65%    
Greater than 45% but less than or equal to 50% | Minimum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.45    
Greater than 45% but less than or equal to 50% | Maximum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.50    
Greater than 45% but less than or equal to 50% | LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.80%    
Greater than 50% but less than or equal to 55% | Minimum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.50    
Greater than 50% but less than or equal to 55% | Maximum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.55    
Greater than 50% but less than or equal to 55% | LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     2.00%    
Greater than 55% | Minimum | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Ratio of net indebtedness to EBITDA     0.55    
Greater than 55% | LIBOR | Unsecured credit facility          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     2.25%