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EARNINGS PER SHARE (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income (loss)                 $ 31,653 $ 6,420 $ (21,799)
Denominator:                      
Shares to be issued - acquisition (in shares)                 36,000 103,000 0
Unvested restricted stock (in shares)                 0 (9,000) (38,000)
Effect of weighted average shares outstanding (in shares)                 (601,000) (338,000) (402,000)
Basic weighted average shares outstanding 47,811,000 47,690,000 47,464,000 45,913,000 42,936,000 42,779,000 42,661,000 42,370,000 47,226,000 42,688,000 41,846,000
Dilutive effect of stock options and stock awards (in shares)                 740,000 1,480,000 0
Diluted weighted average shares outstanding 48,583,000 48,361,000 48,221,000 42,913,000 42,936,000 44,175,000 43,916,000 42,370,000 47,966,000 44,168,000 41,846,000
Antidilutive potentially issuable shares (in shares)                 2,000 2,000 2,219,000
Class A Common Stock                      
Denominator:                      
Common stock, outstanding shares 46,803,000       41,944,000       46,803,000 41,944,000 41,298,000
Class B Common Stock                      
Denominator:                      
Common stock, outstanding shares 988,000       988,000       988,000 988,000 988,000