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Debt - Schedule of Ratio of Net Indebtedness (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Line Of Credit Facility Leverage Range [Line Items]    
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent)   50.00%
Minimum    
Line Of Credit Facility Leverage Range [Line Items]    
Line of credit facility, unused capacity, commitment fee (as a percent)   0.20%
Maximum    
Line Of Credit Facility Leverage Range [Line Items]    
Line of credit facility, unused capacity, commitment fee (as a percent)   0.30%
Senior Unsecured Term Loan | Minimum | Greater than 35% but less than or equal to 45%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.35
Senior Unsecured Term Loan | Minimum | Greater than 45% but less than or equal to 50%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.45
Senior Unsecured Term Loan | Minimum | Greater than 50% but less than or equal to 55%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.5
Senior Unsecured Term Loan | Minimum | Greater than 55%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.55
Senior Unsecured Term Loan | Maximum | Less than or equal to 35%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.35
Senior Unsecured Term Loan | Maximum | Greater than 35% but less than or equal to 45%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.45
Senior Unsecured Term Loan | Maximum | Greater than 45% but less than or equal to 50%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.5
Senior Unsecured Term Loan | Maximum | Greater than 50% but less than or equal to 55%    
Summary of leverage and applicable margin    
Ratio of net indebtedness to EBITDA (as a percent)   0.55
Senior Unsecured Term Loan | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.45%
Interest incurred on the facility $ 0.3 $ 0.3
Senior Unsecured Term Loan | LIBOR | Less than or equal to 35%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.45%
Senior Unsecured Term Loan | LIBOR | Greater than 35% but less than or equal to 45%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.60%
Senior Unsecured Term Loan | LIBOR | Greater than 45% but less than or equal to 50%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.75%
Senior Unsecured Term Loan | LIBOR | Greater than 50% but less than or equal to 55%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.95%
Senior Unsecured Term Loan | LIBOR | Greater than 55%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   2.20%
Line Of Credit Facility Covenant Actual Results    
Line Of Credit Facility Leverage Range [Line Items]    
Maximum leverage ratio (as a percent) 0.239 0.239
Senior unsecured credit facility | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate 1.50% 1.50%
Senior unsecured credit facility | LIBOR | Less than or equal to 35%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.50%
Senior unsecured credit facility | LIBOR | Greater than 35% but less than or equal to 45%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.65%
Senior unsecured credit facility | LIBOR | Greater than 45% but less than or equal to 50%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.80%
Senior unsecured credit facility | LIBOR | Greater than 50% but less than or equal to 55%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   2.00%
Senior unsecured credit facility | LIBOR | Greater than 55%    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   2.25%
Senior unsecured credit facility | LIBOR | Minimum    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.75%
Senior unsecured credit facility | LIBOR | Maximum    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   2.75%