INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Tax Cuts And Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense												$ 300
Deferred tax asset valuation allowance	$ 367				$ 257						$ 367	257
Income tax provision (benefit)	(3,127)	$ (3,698)	$ (5,450)	$ (5,132)	$ (6,583)	$ (6,066)	$ (6,950)	$ (7,124)			(17,407)	(26,723)	$ (22,025)
Unrecognized tax benefits	$ 7,700										7,700
Tax deficit recognized within income tax expense											$ 300
Excess tax benefits related to share-based compensation recognized within income tax expense												$ 500
Excess tax benefits relating to stock-based compensation													$ 590
State income tax returns | Minimum
Income Taxes [Line Items]
Tax examination period											3 years
State income tax returns | Maximum
Income Taxes [Line Items]
Tax examination period											5 years
Tax Year 2016 | Domestic Production Activity
Income Taxes [Line Items]
Income tax provision (benefit)										$ 1,500
Tax Year 2015 | Domestic Production Activity
Income Taxes [Line Items]
Income tax provision (benefit)										$ 1,400
Tax Year 2014 | Domestic Production Activity
Income Taxes [Line Items]
Income tax provision (benefit)									$ 1,200
Tax Year 2013 | Domestic Production Activity
Income Taxes [Line Items]
Income tax provision (benefit)									$ 1,000