SHARE-BASED COMPENSATION - Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding Beginning Balance (in shares)	3,226	4,092	4,817
Granted (in shares)	128	162	432
Exercised (in shares)	(1,174)	(999)	(1,126)
Forfeited (in shares)	(3)	(29)	(31)
Outstanding Ending Balance (in shares)	2,177	3,226	4,092
Exercisable (in shares)	1,424
Weighted Average Exercise Price
Outstanding Beginning Balance (in dollar per share)	$ 145.27	$ 129.51	$ 107.91
Granted (in dollars per share)	403.99	251.58	208.21
Exercised (in dollars per share)	105.97	96.92	66.53
Forfeited (in dollars per share)	165.93	174.54	158.80
Outstanding Ending Balance (in dollars per share)	181.63	$ 145.27	$ 129.51
Exercisable (in dollars per share)	$ 155.06
Weighted Average Remaining Contractual Life (Years), Outstanding	6 years
Weighted Average Remaining Contractual Life (Years), Exercisable	6 years
Aggregate Intrinsic Value, Outstanding	$ 554,709
Aggregate Intrinsic Value, Exercisable	$ 400,814

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.