Equity - Summary of Option Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of shares
Number of shares, Options outstanding, beginning of year	1,575	1,410	1,869
Number of shares, Granted	216	293	296
Number of shares, Exercised	(709)	(128)	(727)
Number of shares, Expired or Forfeited	0	0	(28)
Number of shares, Options outstanding, end of year	1,082	1,575	1,410
Number of shares, Options exercisable, end of year	426	788	562
Weighted average exercise price
Weighted average exercise price, Options outstanding, beginning of year	$ 21.39	$ 18.22	$ 13.46
Weighted average exercise price, Granted	55.72	33.33	31.10
Weighted average exercise price, Exercised	13.60	13.89	10.89
Weighted average exercise price, Expired or Forfeited	0	0	26.41
Weighted average exercise price, Options outstanding, end of year	33.38	21.39	18.22
Weighted average exercise price, Options exercisable, end of year	$ 24.99	$ 15.75	$ 13.68