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Soft Dollar Arrangements - Additional Information (Detail)

v3.5.0.2
Soft Dollar Arrangements - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Soft Dollar Arrangements [Abstract]        
Soft dollar credits $ 199 $ 235 $ 398 $ 470