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Business - Additional Information (Detail)
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Company's ownership percent 89.20% 100.00%
Maryland [Member]    
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Company re-incorporated date Mar. 24, 2011  
Delaware [Member]    
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Company re-incorporated date May 25, 2004  
California [Member]    
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Company originally incorporated date Jun. 14, 1997