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Revolving Credit Facilities - Information Regarding Company's Revolving Credit Facilities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Carrying Value $ 310,000 $ 210,000
Revolving Credit Facility [Member] | Unsecured Debt [Member] | JP Morgan Securities, LLC and Wells Fargo Securities, LLC [Member]    
Debt Instrument [Line Items]    
Carrying Value $ 310,000  
Weighted-Average Interest Rate 1.50%  
Lines of Credit Maturity Date 2019-06  
Revolving Credit Facility [Member] | Unsecured Debt [Member] | PNC Bank National Association [Member]    
Debt Instrument [Line Items]    
Carrying Value $ 0  
Lines of Credit Maturity Date 2019-06