STOCKHOLDERS’ EQUITY - Narrative (Detail) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 $ / shares shares	Sep. 30, 2019 USD ($) vote $ / shares shares	Sep. 30, 2018 shares	May 29, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares	Oct. 26, 2018 $ / shares
Class of Stock [Line Items]
Common stock, par value (usd per share) | $ / shares	$ 0.00001	$ 0.00001			$ 0.00001
Common stock, shares authorized (in shares)	400,000,000	400,000,000			400,000,000
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000		50,000,000	50,000,000
Preferred stock, par value (usd per share) | $ / shares	$ 0.00001	$ 0.00001		$ 0.00001	$ 0.00001
Stock Repurchase Program, Increase (Decrease) [Roll Forward]
Repurchase of common stock | $		$ (157,439)
Repurchase of common stock (in shares)	0	8,389,348
Class A Common Stock
Class of Stock [Line Items]
Common stock, par value (usd per share) | $ / shares				$ 0.00001		$ 0.00001
Common stock, shares authorized (in shares)				400,000,000
Stock Repurchase Program, Increase (Decrease) [Roll Forward]
Number of Voting Rights | vote		1
Repurchase of common stock (in shares)			7,588,771
Class B Common Stock
Class of Stock [Line Items]
Common stock, par value (usd per share) | $ / shares						$ 0.00001
Stock Repurchase Program, Increase (Decrease) [Roll Forward]
Number of Voting Rights | vote		1