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Subsequent Events (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 27, 2017
Feb. 17, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Subsequent Event [Line Items]          
Cash dividend declared per common share (usd per share)   $ 0.10 $ 0.10 $ 0.10  
Accounts receivable, net     $ 76,655   $ 77,803
Commonwealth of Puerto Rico and certain public corporations          
Subsequent Event [Line Items]          
Accounts receivable, net     $ 16,100    
Subsequent Events          
Subsequent Event [Line Items]          
Cash dividend declared per common share (usd per share) $ 0.10