SHARE BASED COMPENSATION - Summary of Share Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Number of Common Shares
Beginning balance (in shares)			430,038
Granted (in shares)			0
Exercised (in shares)	(53,079)	(1,575)	(193,602)	(10,213)
Forfeited (in shares)			0
Expired (in shares)			0
Ending balance (in shares)	236,436		236,436		430,038
Exercisable at end of period (in shares)	236,436		236,436
Weighted Average Exercise Share Price
Beginning balance (in dollars per share)			$ 14.97
Granted (in dollars per share)			0
Exercised (in dollars per share)			13.35
Forfeited (in dollars per share)			0
Expired (in dollars per share)			0
Ending balance (in dollars per share)	$ 16.30		16.30		$ 14.97
Exercisable at end of period (in dollars per share)	$ 16.30		$ 16.30
Weighted Average Contractual Remaining Life (Years)
Balance at end of period			2 years 6 months		3 years
Exercisable at end of period			2 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Beginning balance			$ 6,828
Exercised			5,356
Ending balance	$ 6,311		6,311		$ 6,828
Exercisable at end of period	$ 6,311		$ 6,311