Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivables	$ 4,963	$ 5,236
Reserves for obsolescence inventories	318	331
Accumulated depreciation, rental equipment	705,944	676,376
Accumulated depreciation and amortization, property and equipment	160,637	156,782
Accumulated amortization, operating lease right-of-use assets	20,497	11,197
Accumulated amortization, financing lease right-of-use assets	2,173	2,051
Accumulated amortization, deferred financing costs	14,944	14,419
Accumulated amortization, intangible assets	9,747	6,952
Unaccreted discount, net	2,334	2,691
Deferred financing costs	$ 1,511	$ 1,743
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	40,245,706	39,921,838
Common stock, shares outstanding	36,096,814	35,848,089
Treasury stock, shares	4,148,892	4,073,749