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Segment Information - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]      
Number of operating business segments | Segment 3    
Amount of revenue from major customer of total revenue $ 373,528 $ 361,788 $ 358,402
Major Customer [Member] | Sales Revenue, Net [Member]      
Segment Reporting Information [Line Items]      
Amount of revenue from major customer of total revenue $ 167,300 $ 161,800 $ 164,400
Major Customer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Revenue from next largest customer, percentage of total revenue 45.00% 45.00% 46.00%
Puerto Rico [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Revenue from next largest customer, percentage of total revenue 9.00% 10.00% 11.00%