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Indebtedness - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]    
Available borrowings capacity under credit agreement   $ 22,710,000
Senior secured credit facility term 5 years  
Senior secured credit facility, maturity date Jun. 17, 2018  
Maximum    
Debt Instrument [Line Items]    
Capacity to increase borrowings under credit agreement $ 65,373,000  
Revolving Line of Credit    
Debt Instrument [Line Items]    
Available borrowings capacity under credit agreement 200,000,000  
Term Loan | Maximum    
Debt Instrument [Line Items]    
Accordion feature $ 100,000,000