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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Estimated Useful Lives and Residual Values of Company's Rental Equipment | The estimated useful lives and residual values of the Company’s rental equipment used for financial reporting purposes are as follows:
Relocatable modular buildings |  | 18 years, 50% residual value
Relocatable modular accessories |  | 3 to 18 years, no residual value
Blast resistant modules |  | 20 years, no residual value
Portable storage containers |  | 25 years, 62.5% residual value
Electronic test equipment and accessories |  | 1 to 8 years, no residual value
Liquid and solid containment tanks and boxes and accessories |  | 3 to 20 years, no residual value
Property, Plant and Equipment | Property, plant and equipment consist of the following:
(dollar amounts in thousands) |  | Estimated useful life |  |  | December 31, |
|  | in years |  |  | 2018 |  |  | 2017 |
Land |  | Indefinite |  |  | $ | 50,689 |  |  | $ | 50,689 |
Land improvements |  | 20 – 50 |  |  |  | 50,064 |  |  |  | 43,337 |
Buildings |  |  | 30 |  |  |  | 29,359 |  |  |  | 26,862 |
Furniture, office and computer equipment |  | 3 – 10 |  |  |  | 33,081 |  |  |  | 32,118 |
Vehicles and machinery |  | 5 – 25 |  |  |  | 38,199 |  |  |  | 34,597 |
|  |  |  |  |  |  | 201,392 |  |  |  | 187,603 |
Less accumulated depreciation |  |  |  |  |  |  | (77,118 | ) |  |  | (70,034 | )
|  |  |  |  |  |  | 124,274 |  |  |  | 117,569 |
Construction in progress |  |  |  |  |  |  | 2,625 |  |  |  | 1,601 |
|  |  |  |  |  | $ | 126,899 |  |  | $ | 119,170 |
Weighted-Average Common Stock Used to Calculate Basic and Diluted Earnings per Share | The table below presents the weighted-average common stock used to calculate basic and diluted earnings per share:
(in thousands) |  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted-average common stock for calculating basic earnings per share |  |  | 24,141 |  |  |  | 23,999 |  |  |  | 23,900 |
Effect of potentially dilutive securities from equity-based compensation |  |  | 399 |  |  |  | 270 |  |  |  | 76 |
Weighted-average common stock for calculating diluted earnings per share |  |  | 24,540 |  |  |  | 24,269 |  |  |  | 23,976 |
Securities Not Included in Computation of Diluted Earnings Per Share | The following securities were not included in the computation of diluted earnings per share as their effect would have been anti-dilutive:
(in thousands) |  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Options to purchase common stock |  |  | — |  |  |  | 7 |  |  |  | 661 |
Summary of Allowance for Doubtful Accounts Activity | The allowance for doubtful accounts activity was as follows:
(in thousands) |  | 2018 |  |  | 2017 |
Beginning balance, January 1 |  | $ | 1,920 |  |  | $ | 2,087 |
Provision for doubtful accounts |  |  | 581 |  |  |  | 1,480 |
Write-offs, net of recoveries |  |  | (618 | ) |  |  | (1,647 | )
Ending balance, December 31 |  | $ | 1,883 |  |  | $ | 1,920 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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