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EARNINGS PER SHARE (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income                 $ 91,106 $ 31,653 $ 6,420
Denominator:                      
Shares to be issued - acquisition (in shares)                 0 36,000 103,000
Unvested restricted stock (in shares)                 (2,000) 0 (9,000)
Effect of weighted average shares outstanding (in shares)                 (2,294,000) (601,000) (338,000)
Basic weighted average shares outstanding 50,436,000 48,370,000 48,348,000 48,005,000 47,811,000 47,690,000 47,464,000 45,913,000 48,793,000 47,226,000 42,688,000
Dilutive effect of stock options and stock awards (in shares)                 252,000 740,000 1,480,000
Diluted weighted average shares outstanding 50,719,000 48,619,000 48,563,000 48,262,000 48,583,000 48,361,000 48,221,000 45,913,000 49,045,000 47,966,000 44,168,000
Antidilutive potentially issuable shares (in shares)                 0 2,000 2,000
Class A Common Stock                      
Denominator:                      
Common stock, outstanding shares 50,101,000       46,803,000       50,101,000 46,803,000 41,944,000
Class B Common Stock                      
Denominator:                      
Common stock, outstanding shares 988,000       988,000       988,000 988,000 988,000