XML 64 R50.htm IDEA: XBRL DOCUMENT v3.3.1.900
Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]        
Fixed interest rate for interest rate swap contract     3.39% 3.39%
Interest rate swap, start date   Mar. 30, 2011    
Interest rate swap, expiration date   Dec. 31, 2014    
Total indebtedness $ 69,055 $ 99,526    
Maximum        
Debt Instrument [Line Items]        
Capacity to increase borrowings under credit agreement 67,624      
Secured Revolving Credit Facility        
Debt Instrument [Line Items]        
Average line of credit facility outstanding $ 94,765 $ 94,899    
Weighted average interest rate 2.10% 2.50%