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Credit Facilities - Additional Information (Details) - USD ($)
$ in Millions
Mar. 22, 2013
Sep. 30, 2017
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.75%  
Revolving Credit Facility [Member] | Wells Fargo [Member]    
Line of Credit Facility [Line Items]    
Line of credit, available borrowings $ 50.0  
Letter of Credit [Member] | Wells Fargo [Member]    
Line of Credit Facility [Line Items]    
Line of credit, available borrowings $ 10.0  
Outstanding   $ 0.0