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Debt - Revolving Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jun. 19, 2014
Sep. 30, 2015
Nov. 30, 2014
Dec. 31, 2015
Aug. 04, 2015
Dec. 31, 2014
Oct. 17, 2014
Jun. 30, 2014
Debt Instrument [Line Items]                
Aggregate committed amount of credit facility   $ 1,950,000,000            
Credit facility, amendment fees incurred   100,000            
Term Loans [Member]                
Debt Instrument [Line Items]                
Aggregate committed amount of credit facility   250,000,000            
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Amount of senior unsecured credit facility paid off $ 900,000,000              
Accordion to credit facility   400,000,000         $ 250,000,000  
Aggregate committed amount of credit facility   $ 1,300,000,000     $ 1,250,000,000   1,150,000,000  
Revolving Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Accordion to credit facility             $ 400,000,000  
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Amount of senior unsecured debt 775,000,000              
Credit facilities, amount outstanding       $ 1,100,000,000   $ 593,500,000    
Refinancing charge               $ 300,000
Aggregate committed amount of credit facility       $ 200,000,000        
Debt instrument, basis spread of interest rate     0.40%          
Credit facilities, percentage of commitment fee on unused capacity     0.30%          
Credit facilities, weighted average interest rate       1.70%   2.20%    
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Federal Funds Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate     0.50%          
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Euro Dollar Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate     1.00%          
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | London Interbank Offered Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate     1.40%          
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Credit facilities, amount outstanding 400,000,000              
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Credit facilities, amount outstanding 100,000,000              
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Federal Funds Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       0.50%        
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Euro Dollar Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       1.00%        
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       0.70%        
Credit facilities, percentage of commitment fee on unused capacity       0.25%        
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Minimum [Member] | London Interbank Offered Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       1.70%        
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       1.25%        
Credit facilities, percentage of commitment fee on unused capacity       0.35%        
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility Matures in June 2018 [Member] | Maximum [Member] | London Interbank Offered Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument, basis spread of interest rate       2.25%        
Revolving Credit Facility [Member] | Term Loans [Member]                
Debt Instrument [Line Items]                
Amount of senior unsecured credit facility paid off 250,000,000              
Amount of senior unsecured debt $ 125,000,000