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Net Income Per Common Share (Narrative) (Detail) - $ / shares
shares in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 21, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2015
Net Income Per Common Share [Line Items]            
Common equivalent shares excluded from computation of earnings per share due to net loss   6 158 20 221  
Antidilutive securities excluded from computation of earnings per share   2,024 197 1,598 129  
Citron and Lucid            
Net Income Per Common Share [Line Items]            
Number of shares issued in connection with acquisition included in weighted average shares outstanding 5,122 5,122 5,122 5,122 5,122  
Convertible Senior Notes            
Net Income Per Common Share [Line Items]            
Senior notes, initial conversion price per share           $ 33.215