Annual report pursuant to Section 13 and 15(d)

Dividends (Parenthetical) (Detail)

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Dividends (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]      
Dividends related to outstanding restricted stock units $ 670 $ 624 $ 558