Mobile Mini, Inc. - Organization and Description of Business (Policies)	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The consolidated financial statements include the accounts of Mobile Mini and our wholly owned subsidiaries. We do not have any subsidiaries in which we do not own 100% of the outstanding stock. All significant intercompany balances and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) applicable to interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. In the opinion of management of Mobile Mini, all adjustments (which include normal recurring adjustments) necessary to present fairly the financial position, results of operations, and cash flows for all periods presented have been made. The results of operations for the three months ended March 31, 2020 and 2019, respectively, are not necessarily indicative of the results to be expected for the full year. These condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 filed with the Securities and Exchange Commission (“SEC”) on February 3, 2020.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying condensed consolidated financial statements and the notes to those statements. Actual results could differ from those estimates. Significant estimates affect the calculation of depreciation and amortization, the calculation of the allowance for doubtful accounts, the analysis of goodwill and long-lived assets for potential impairment and certain accrued liabilities.
Recent Developments – Merger Agreement	On March 1, 2020, Mobile Mini entered into a definitive merger agreement (the “Merger Agreement”) with WillScot Corporation (“WillScot”). The Merger Agreement provides for the merger of Mobile Mini with and into a newly formed subsidiary of WillScot, with Mobile Mini surviving as a wholly owned subsidiary (the Merger”). At the effective time of the Merger, and subject to the terms and conditions set forth in the Merger Agreement, each outstanding share of the common stock of Mobile Mini shall be converted into the right to receive 2.4050 shares of WillScot Class A common stock. The board of directors of both Mobile Mini and WillScot approved the Merger and the Merger Agreement and have recommended that their stockholders vote in favor of the adoption of the Merger Agreement. The Merger is subject to customary closing conditions, including receipt of regulatory and stockholder approvals by the Mobile Mini and WillScot stockholders, and is expected to close in the third quarter of 2020. In the Condensed Consolidated Statement of Income for the three months ended March 31, 2020, $15.5 million of merger-related expenses are included in the rental, selling and general expenses.
Recent Developments Covid-19	Recent Developments – COVID-19 On January 30, 2020, the World Health Organization declared an outbreak of a highly contagious form of an upper respiratory infection caused by COVID-19, a novel coronavirus strain commonly referred to as “coronavirus”. Mobile Mini has been deemed an essential infrastructure business, which means we continue to supply our products and services in most of the areas in which we operate; however, federal and local guidelines and restrictions have significantly curtailed the level of economic activity in affected areas, which include the areas in which we conduct our business. See additional information regarding COVID-19 in “Item 1A. Risk Factors”.
Fair Value Measurements	Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value is a market-based measurement determined by assumptions that market participants would use in pricing an asset or liability. We categorize each of our fair value measurements in one of the following three levels based on the lowest level of input that is significant to the fair value measurement: Level 1 — Observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2 — Observable inputs, other than Level 1 inputs in active markets, that are observable either directly or indirectly; and Level 3 — Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions.
Earnings Per Share	Basic earnings per share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Restricted stock awards are subject to the risk of forfeiture and are not included in the calculation of basic weighted average number of common shares outstanding until vested. Diluted EPS is calculated under the treasury stock method. Potential common shares include restricted common stock and incremental shares of common stock issuable upon the exercise of stock options.
Segment Reporting, Policy	Our operations are comprised of three reportable segments: North America Storage Solutions, U.K. Storage Solutions and Tank & Pump Solutions. Discrete financial data on each of our products is not available and it would be impractical to collect and maintain financial data in such a manner. The results for each segment are reviewed discretely by our chief operating decision maker. We operate in the U.S., the U.K. and Canada. All of our locations operate in their local currency. Although we are exposed to foreign exchange rate fluctuation in foreign markets where we rent and sell our products, we do not believe such exposure will have a significant impact on our results of operations. Revenues recognized by our U.S. locations were $128.0 million for both the three months ended March 31, 2020 and 2019.
Impact of Recently Issued Accounting Standards	Impact of Recently Issued Accounting Standards Intangibles – Goodwill and Other – Internal-Use Software. In August 2018, the Financial Accounting Standards Board (the “FASB”) issued a standard that provides guidance on accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software, and hosting arrangements that include an internal-use software license. This guidance also requires entities to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement and classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element. The entity is also required to present the capitalized implementation costs in the statement of financial position in the same line item that a prepayment for the fees of the associated hosting arrangement would be presented. This standard is effective for annual and interim periods beginning after December 15, 2019. We adopted this standard on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements. Intangibles – Goodwill and Other. In January 2017, the FASB issued a standard requiring an entity to no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment is measured using the difference between the carrying amount and the fair value of the reporting unit. This standard is effective for annual and interim periods beginning after December 15, 2019. We adopted this standard on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements. Financial Instruments – Credit Losses. In June 2016, the FASB issued guidance amending the previous guidance on impairment of financial instruments. Among other things, the new guidance requires expectations of future credit losses to be based on relevant information from past events, including historical experience, current conditions and reasonable and supportable forecasts that affect collectability. This guidance does not apply to receivables arising from direct rental revenue related to our operating leases. The guidance will be effective for fiscal years and interim periods beginning after December 15, 2019. We adopted this standard utilizing a modified-retrospective approach on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements.
Rental Fleet, Policy	Rental fleet is capitalized at cost and depreciated over the estimated useful life of the unit using the straight-line method. Rental fleet is depreciated whether or not it is out on rent. Capitalized cost of rental fleet includes the price paid to acquire the unit and freight charges to the location when the unit is first placed in service, and when applicable, the cost of manufacturing or remanufacturing, which includes the cost of customizing units. Ordinary repair and maintenance costs are charged to operations as incurred. We periodically review depreciable lives and residual values against various factors, including the results of our lenders’ independent appraisal of our rental fleet, practices of our competitors in comparable industries and profit margins achieved on sales of depreciated units.

Mobile Mini, Inc. - Organization and Description of Business (Policies)

3 Months Ended

Mar. 31, 2020

The consolidated financial statements include the accounts of Mobile Mini and our wholly owned subsidiaries. We do not have any subsidiaries in which we do not own 100% of the outstanding stock. All significant intercompany balances and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) applicable to interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. In the opinion of management of Mobile Mini, all adjustments (which include normal recurring adjustments) necessary to present fairly the financial position, results of operations, and cash flows for all periods presented have been made. The results of operations for the three months ended March 31, 2020 and 2019, respectively, are not necessarily indicative of the results to be expected for the full year.

These condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 filed with the Securities and Exchange Commission (“SEC”) on February 3, 2020.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying condensed consolidated financial statements and the notes to those statements. Actual results could differ from those estimates. Significant estimates affect the calculation of depreciation and amortization, the calculation of the allowance for doubtful accounts, the analysis of goodwill and long-lived assets for potential impairment and certain accrued liabilities.

Recent Developments – Merger Agreement

On March 1, 2020, Mobile Mini entered into a definitive merger agreement (the “Merger Agreement”) with WillScot Corporation (“WillScot”). The Merger Agreement provides for the merger of Mobile Mini with and into a newly formed subsidiary of WillScot, with Mobile Mini surviving as a wholly owned subsidiary (the Merger”). At the effective time of the Merger, and subject to the terms and conditions set forth in the Merger Agreement, each outstanding share of the common stock of Mobile Mini shall be converted into the right to receive 2.4050 shares of WillScot Class A common stock. The board of directors of both Mobile Mini and WillScot approved the Merger and the Merger Agreement and have recommended that their stockholders vote in favor of the adoption of the Merger Agreement. The Merger is subject to customary closing conditions, including receipt of regulatory and stockholder approvals by the Mobile Mini and WillScot stockholders, and is expected to close in the third quarter of 2020. In the Condensed Consolidated Statement of Income for the three months ended March 31, 2020, $15.5 million of merger-related expenses are included in the rental, selling and general expenses.

Recent Developments Covid-19

Recent Developments – COVID-19

On January 30, 2020, the World Health Organization declared an outbreak of a highly contagious form of an upper respiratory infection caused by COVID-19, a novel coronavirus strain commonly referred to as “coronavirus”. Mobile Mini has been deemed an essential infrastructure business, which means we continue to supply our products and services in most of the areas in which we operate; however, federal and local guidelines and restrictions have significantly curtailed the level of economic activity in affected areas, which include the areas in which we conduct our business. See additional information regarding COVID-19 in “Item 1A. Risk Factors”.

Fair Value Measurements

Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value is a market-based measurement determined by assumptions that market participants would use in pricing an asset or liability. We categorize each of our fair value measurements in one of the following three levels based on the lowest level of input that is significant to the fair value measurement:

Level 1 — Observable inputs such as quoted prices in active markets for identical assets or liabilities;

Level 2 — Observable inputs, other than Level 1 inputs in active markets, that are observable either directly or indirectly; and

Level 3 — Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions.

Earnings Per Share

Basic earnings per share (“EPS”) is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Restricted stock awards are subject to the risk of forfeiture and are not included in the calculation of basic weighted average number of common shares outstanding until vested. Diluted EPS is calculated under the treasury stock method. Potential common shares include restricted common stock and incremental shares of common stock issuable upon the exercise of stock options.

Segment Reporting, Policy

Our operations are comprised of three reportable segments: North America Storage Solutions, U.K. Storage Solutions and Tank & Pump Solutions. Discrete financial data on each of our products is not available and it would be impractical to collect and maintain financial data in such a manner. The results for each segment are reviewed discretely by our chief operating decision maker.

We operate in the U.S., the U.K. and Canada. All of our locations operate in their local currency. Although we are exposed to foreign exchange rate fluctuation in foreign markets where we rent and sell our products, we do not believe such exposure will have a significant impact on our results of operations. Revenues recognized by our U.S. locations were $128.0 million for both the three months ended March 31, 2020 and 2019.

Impact of Recently Issued Accounting Standards

Intangibles – Goodwill and Other – Internal-Use Software. In August 2018, the Financial Accounting Standards Board (the “FASB”) issued a standard that provides guidance on accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software, and hosting arrangements that include an internal-use software license.

This guidance also requires entities to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement and classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element. The entity is also required to present the capitalized implementation costs in the statement of financial position in the same line item that a prepayment for the fees of the associated hosting arrangement would be presented. This standard is effective for annual and interim periods beginning after December 15, 2019. We adopted this standard on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements.

Intangibles – Goodwill and Other. In January 2017, the FASB issued a standard requiring an entity to no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment is measured using the difference between the carrying amount and the fair value of the reporting unit. This standard is effective for annual and interim periods beginning after December 15, 2019. We adopted this standard on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements.

Financial Instruments – Credit Losses. In June 2016, the FASB issued guidance amending the previous guidance on impairment of financial instruments. Among other things, the new guidance requires expectations of future credit losses to be based on relevant information from past events, including historical experience, current conditions and reasonable and supportable forecasts that affect collectability. This guidance does not apply to receivables arising from direct rental revenue related to our operating leases. The guidance will be effective for fiscal years and interim periods beginning after December 15, 2019. We adopted this standard utilizing a modified-retrospective approach on January 1, 2020. The adoption did not have a material effect on our consolidated financial statements.

Rental Fleet, Policy

Rental fleet is capitalized at cost and depreciated over the estimated useful life of the unit using the straight-line method. Rental fleet is depreciated whether or not it is out on rent. Capitalized cost of rental fleet includes the price paid to acquire the unit and freight charges to the location when the unit is first placed in service, and when applicable, the cost of manufacturing or remanufacturing, which includes the cost of customizing units. Ordinary repair and maintenance costs are charged to operations as incurred.

We periodically review depreciable lives and residual values against various factors, including the results of our lenders’ independent appraisal of our rental fleet, practices of our competitors in comparable industries and profit margins achieved on sales of depreciated units.