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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Repurchase of common shares, cost   $ 36,341
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Repurchase of common shares 1.2  
Repurchase of common shares, cost $ 14,100