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Indebtedness - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]    
Available borrowings capacity under credit agreement   $ 64,057,000
Senior secured credit facility term 5 years  
Duration of losses in other comprehensive income expected to be reclassified to earnings 12 months  
Maximum    
Debt Instrument [Line Items]    
Capacity to increase borrowings under credit agreement $ 27,101,000  
Term Loan | Maximum    
Debt Instrument [Line Items]    
Accordion feature 100,000,000  
Revolving Line of Credit    
Debt Instrument [Line Items]    
Available borrowings capacity under credit agreement 200,000,000  
Cash Flow Hedging | Interest Rate Swap    
Debt Instrument [Line Items]    
Gains (losses) in other comprehensive income expected to be reclassified to earnings $ 0