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Financing Agreement - Additional Information (Detail)
ft² in Thousands
1 Months Ended
May 31, 2016
Dec. 31, 2013
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jan. 09, 2015
ft²
Aug. 31, 2011
USD ($)
Debt Instrument [Line Items]                
Area of Real Estate Property | ft²             725  
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018                
Debt Instrument [Line Items]                
Proceeds from Issuance of Debt     $ 25,000,000          
Mortgage note payable       $ 25,000,000 $ 25,000,000      
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021                
Debt Instrument [Line Items]                
Proceeds from Issuance of Debt     $ 75,000,000          
Mortgage note payable       75,000,000 75,000,000      
Senior Notes | Senior Unsecured Notes 3.13% Due December 2020                
Debt Instrument [Line Items]                
Proceeds from Issuance of Debt   $ 100,000,000            
Mortgage note payable       100,000,000 100,000,000      
Notes payable and other                
Debt Instrument [Line Items]                
Mortgage note payable       14,304,000 15,698,000      
Notes payable and other | Mortgages [Member]                
Debt Instrument [Line Items]                
Mortgage note payable           $ 14,500,000    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity       600,000,000   $ 500,000,000   $ 350,000,000
Revolving loan facility       135,793,000 225,707,000      
Term loan                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount       500,000,000        
Debt Instrument, Term 12 months              
Revolving loan facility       $ 100,000,000 $ 0