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Indebtedness - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Debt Instrument [Line Items]    
Available borrowings capacity under credit agreement   $ 27,101,000
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 $ 92,588,000  
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