STOCKHOLDERS’ EQUITY - Additional Information (Detail)				1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 17, 2018 shares	Jan. 17, 2018 USD ($) shares	Jan. 08, 2018 USD ($) shares	Jan. 31, 2018 shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 shares	Jun. 30, 2018 USD ($) vote	Jun. 30, 2017 shares	Jan. 03, 2018 USD ($)
Class of Stock [Line Items]
Repurchase of common stock (in shares) | shares					0	0		0
Authorized amount for Stock Repurchase Program									$ 200,000,000
Additional common stock repurchased		$ 101,800,000	$ 100,000,000
Remaining amount authorized for repurchase					$ 95,900,000		$ 95,900,000
Class A Common Stock
Class of Stock [Line Items]
Voting rights per share | vote							1
Class B Common Stock
Class of Stock [Line Items]
Voting rights per share | vote							1
Repurchase of common stock (in shares) | shares	7,600,000	3,800,000	3,800,000	7,600,000