Basis of Presentation and Significant Accounting Policies [Text Block] | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation — The accompanying Interim Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP). The Company is the sole member or stockholder of various consolidated limited liability companies and corporations established to operate various acquired skilled nursing and senior living operations, home health, hospice and home care operations, and related ancillary services. All intercompany transactions and balances have been eliminated in consolidation. The condensed consolidated financial statements include the accounts of all entities controlled by the Company through its ownership of a majority voting interest. The Company presents noncontrolling interests within the equity section of its condensed consolidated balance sheets. The Company presents the amount of consolidated net income that is attributable to The Ensign Group, Inc. and the noncontrolling interest in its condensed consolidated statements of income. The condensed consolidated financial statements include the accounts of all entities controlled by the Company through its ownership of a majority voting interest and the accounts of any variable interest entities (VIEs) where the Company is subject to a majority of the risk of loss from the VIE's activities, or entitled to receive a majority of the entity's residual returns, or both. The Company assesses the requirements related to the consolidation of VIEs, including a qualitative assessment of power and economics that considers which entity has the power to direct the activities that "most significantly impact" the VIE's economic performance and has the obligation to absorb losses of, or the right to receive benefits that could be potentially significant to, the VIE. The Company's relationship with variable interest entities was not material during the three months ended March 31, 2019 . The Company completed the sale of one of its senior living operations for a sale price of $1,838 during the three months ended March 31, 2019 . The sale transaction does not meet the criteria of discontinued operations as it does not represent a strategic shift that has, or will have, a major effect on the Company's operations and financial results. The Company presented property and equipment assets of the senior living operation sold as held for sale in the consolidated balance sheet as of December 31, 2018. Reclassifications - Certain prior period amounts have been reclassified to conform to the current financial statement presentation, with no effect on the Company's consolidated financial position or results of operations. Estimates and Assumptions — The preparation of Interim Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Interim Financial Statements and the reported amounts of revenue and expenses during the reporting periods. The most significant estimates in the Company’s Interim Financial Statements relate to revenue, intangible assets and goodwill, impairment of long-lived assets, general and professional liability, workers' compensation and healthcare claims included in accrued self-insurance liabilities, and income taxes. Actual results could differ from those estimates. Fair Value of Financial Instruments — The Company’s financial instruments consist principally of cash and cash equivalents, debt security investments, accounts receivable, insurance subsidiary deposits, accounts payable and borrowings. The Company believes all of the financial instruments’ recorded values approximate fair values because of their nature or respective short durations. Revenue Recognition — On January 1, 2018, the Company adopted Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (ASC 606) applying the modified retrospective method. The adoption of ASC 606 did not have a material impact on the measurement nor on the recognition of revenue of contracts, for which all revenue had not been recognized, as of January 1, 2018, therefore no cumulative adjustment has been made to the opening balance of retained earnings at the beginning of 2018. See Note 4, Revenue and Accounts Receivable . Accounts Receivable and Allowance for Doubtful Accounts — Accounts receivable consist primarily of amounts due from Medicare and Medicaid programs, other government programs, managed care health plans and private payor sources, net of estimates for variable consideration. The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance. The Company determines the allowance based on known troubled accounts and other currently available evidence. See Note 4, Revenue and Accounts Receivable . Property and Equipment — Property and equipment are initially recorded at their historical cost. Repairs and maintenance are expensed as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the depreciable assets (ranging from three to 59 years ). Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the remaining lease term. Impairment of Long-Lived Assets — The Company reviews the carrying value of long-lived assets that are held and used in the Company’s operating subsidiaries for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of these assets is determined based upon expected undiscounted future net cash flows from the operating subsidiaries to which the assets relate, utilizing management’s best estimate, appropriate assumptions, and projections at the time. If the carrying value is determined to be unrecoverable from future operating cash flows, the asset is deemed impaired and an impairment loss would be recognized to the extent the carrying value exceeded the estimated fair value of the asset. The Company estimates the fair value of assets based on the estimated future discounted cash flows of the asset. Management has evaluated its long-lived assets and recorded an impairment charge of $155 during the three months ended March 31, 2018 . The Company did not record an impairment charge during the three months ended March 31, 2019 . Leases and Leasehold Improvements - The Company leases skilled nursing facilities, senior living facilities and commercial office space. On January 1, 2019, the Company adopted Accounting Standards Codification Topic 842, Leases (ASC 842), electing the transition method that allows it to apply the standard as of the adoption date and record a cumulative adjustment in retained earnings. The Company determines if an arrangement is a lease at the inception of each lease. At the inception of each lease, the Company performs an evaluation to determine whether the lease should be classified as an operating or finance lease. Operating leases are included in operating lease assets, current operating lease liabilities and noncurrent operating lease liabilities on the Company's condensed consolidated balance sheet. As the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at lease commencement date in determining the present value of future lease payments. The Company estimates this rate based on prevailing financial market conditions, comparable company and credit analysis, and management judgment. The Company records rent expense for operating leases on a straight-line basis over the term of the lease. The lease term used for straight-line rent expense is calculated from the date the Company is given control of the leased premises through the end of the lease term. The lease term excludes lease renewals as the renewal rents are not at a bargain, there are no economic penalties for the Company to renew the lease, and it is not reasonably assured that the Company will exercise the extension options. The lease term used for this evaluation also provides the basis for establishing depreciable lives for buildings subject to lease and leasehold improvements. The Company recognizes lease expense for leases with an initial term of 12 months or less on a straight-line basis over the lease term. These leases are not recorded on the condensed consolidated balance sheet. Certain of the Company's lease agreements include rental payments that are adjusted periodically for inflation. The lease agreements do not contain any material residual value guarantees or material restrictive covenants. The Company does not have material subleases. See further discussion at Note 17, Leases . Intangible Assets and Goodwill — Definite-lived intangible assets consist primarily of patient base, facility trade names and customer relationships. Trade names at affiliated facilities are amortized over 30 years and customer relationships are amortized over a period of up to 20 years . The Company's indefinite-lived intangible assets consist of trade names, and Medicare and Medicaid licenses. The Company tests indefinite-lived intangible assets for impairment on an annual basis or more frequently if events or changes in circumstances indicate that the carrying amount of the intangible asset may not be recoverable. Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. Goodwill is subject to annual testing for impairment. In addition, goodwill is tested for impairment if events occur or circumstances change that would reduce the fair value of a reporting unit below its carrying amount. The Company performs its annual test for impairment during the fourth quarter of each year. The Company did not identify any goodwill and intangible assets impairment during the three months ended March 31, 2019 and 2018 . See further discussion at Note 11, Goodwill and Other Indefinite-Lived Intangible Assets . Self-Insurance — The Company is partially self-insured for general and professional liability up to a base amount per claim (the self-insured retention) with an aggregate, one-time deductible above this limit. Losses beyond these amounts are insured through third-party policies with coverage limits per claim, per location and on an aggregate basis for the Company. The combined self-insured retention is $500 per claim, subject to an additional one-time deductible of $750 for California affiliated operations and a separate, one-time, deductible of $1,000 for non-California operations. For all affiliated operations, except those located in Colorado, the third-party coverage above these limits is $1,000 per claim, $3,000 per operation, with a $5,000 blanket aggregate limit and an additional state-specific aggregate where required by state law. In Colorado, the third-party coverage above these limits is $1,000 per claim and $3,000 per operation, which is independent of the aforementioned blanket aggregate limits that apply outside of Colorado. The self-insured retention and deductible limits for general and professional liability and workers' compensation for all states (except Texas, Washington and Wyoming for workers' compensation) are self-insured through the Captive, the related assets and liabilities of which are included in the accompanying condensed consolidated balance sheets. The Captive is subject to certain statutory requirements as an insurance provider. The Company’s policy is to accrue amounts equal to the actuarially estimated costs to settle open claims of insureds, as well as an estimate of the cost of insured claims that have been incurred but not reported. The Company develops information about the size of the ultimate claims based on historical experience, current industry information and actuarial analysis, and evaluates the estimates for claim loss exposure on a quarterly basis. Accrued general liability and professional malpractice liabilities on an undiscounted basis, net of anticipated insurance recoveries, were $43,200 and $42,635 as of March 31, 2019 and December 31, 2018 , respectively. The Company’s operating subsidiaries are self-insured for workers’ compensation in California. To protect itself against loss exposure in California with this policy, the Company has purchased individual specific excess insurance coverage that insures individual claims that exceed $500 per occurrence. In Texas, the operating subsidiaries have elected non-subscriber status for workers’ compensation claims and the Company has purchased individual stop-loss coverage that insures individual claims that exceed $750 per occurrence. The Company’s operating subsidiaries in all other states, with the exception of Washington and Wyoming, are under a loss sensitive plan that insures individual claims that exceed $350 per occurrence. In Washington and Wyoming, the operating subsidiaries' coverage is financed through premiums paid by the employers and employees. The claims and benefit payments are managed through a state insurance pool. Outside of California, Texas, Washington and Wyoming, the Company has purchased insurance coverage that insures individual claims that exceed $350 per accident. In all states except Washington and Wyoming, the Company accrues amounts equal to the estimated costs to settle open claims, as well as an estimate of the cost of claims that have been incurred but not reported. The Company uses actuarial valuations to estimate the liability based on historical experience and industry information. Accrued workers’ compensation liabilities are recorded on an undiscounted basis in the accompanying condensed consolidated balance sheets and were $25,171 and $24,624 as of March 31, 2019 and December 31, 2018 , respectively. In addition, the Company has recorded an asset and equal liability of $7,360 and $6,969 at March 31, 2019 and December 31, 2018 , respectively, in order to present the ultimate costs of malpractice and workers' compensation claims and the anticipated insurance recoveries on a gross basis. See Note 12, Restricted and Other Assets. The Company self-funds medical (including prescription drugs) and dental healthcare benefits to the majority of its employees. The Company is fully liable for all financial and legal aspects of these benefit plans. To protect itself against loss exposure with this policy, the Company has purchased individual stop-loss insurance coverage that insures individual claims that exceed $300 for each covered person with an additional one-time aggregate individual stop loss deductible of $75 . Beginning 2016, the Company's policy does not include the additional one-time aggregate individual stop loss deductible of $75 . The Company’s accrued liability under these plans recorded on an undiscounted basis in the accompanying condensed consolidated balance sheets was $6,063 and $5,823 as of March 31, 2019 and December 31, 2018 , respectively. The Company believes that adequate provision has been made in the Interim Financial Statements for liabilities that may arise out of patient care, workers’ compensation, healthcare benefits and related services provided to date. The amount of the Company’s reserves was determined based on an estimation process that uses information obtained from both company-specific and industry data. This estimation process requires the Company to continuously monitor and evaluate the life cycle of the claims. Using data obtained from this monitoring and the Company’s assumptions about emerging trends, the Company, with the assistance of an independent actuary, develops information about the size of ultimate claims based on the Company’s historical experience and other available industry information. The most significant assumptions used in the estimation process include determining the trend in costs, the expected cost of claims incurred but not reported and the expected costs to settle or pay damage awards with respect to unpaid claims. The self-insured liabilities are based upon estimates, and while management believes that the estimates of loss are reasonable, the ultimate liability may be in excess of or less than the recorded amounts. Due to the inherent volatility of actuarially determined loss estimates, it is reasonably possible that the Company could experience changes in estimated losses that could be material to net income. If the Company’s actual liability exceeds its estimates of loss, its future earnings, cash flows and financial condition would be adversely affected. Income Taxes — Deferred tax assets and liabilities are established for temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities at tax rates in effect when such temporary differences are expected to reverse. The Company generally expects to fully utilize its deferred tax assets; however, when necessary, the Company records a valuation allowance to reduce its net deferred tax assets to the amount that is more likely than not to be realized. In determining the need for a valuation allowance or the need for and magnitude of liabilities for uncertain tax positions, the Company makes certain estimates and assumptions. These estimates and assumptions are based on, among other things, knowledge of operations, markets, historical trends and likely future changes and, when appropriate, the opinions of advisors with knowledge and expertise in certain fields. Due to certain risks associated with the Company’s estimates and assumptions, actual results could differ. Noncontrolling Interest — The noncontrolling interest in a subsidiary is initially recognized at estimated fair value on the acquisition date and is presented within total equity in the Company's condensed consolidated balance sheets. The Company presents the noncontrolling interest and the amount of consolidated net income attributable to The Ensign Group, Inc. in its condensed consolidated statements of income and net income per share is calculated based on net income attributable to The Ensign Group, Inc.'s stockholders. The carrying amount of the noncontrolling interest is adjusted based on an allocation of subsidiary earnings based on ownership interest. Share-Based Compensation — The Company measures and recognizes compensation expense for all share-based payment awards made to employees and directors including employee stock options based on estimated fair values, ratably over the requisite service period of the award. Net income has been reduced as a result of the recognition of the fair value of all stock options and restricted stock awards issued, the amount of which is contingent upon the number of future grants and other variables. Recent Accounting Pronouncements — Except for rules and interpretive releases of the Securities and Exchange Commission (SEC) under authority of federal securities laws and a limited number of grandfathered standards, the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) is the sole source of authoritative GAAP literature recognized by the FASB and applicable to the Company. For any new pronouncements announced, the Company considers whether the new pronouncements could alter previous generally accepted accounting principles and determines whether any new or modified principles will have a material impact on the Company's reported financial position or operations in the near term. The applicability of any standard is subject to the formal review of the Company's financial management and certain standards are under consideration. Recent Accounting Standards Adopted by the Company In February 2016, the FASB established Topic 842, Leases , by issuing Accounting Standards Update (ASU) No. 2016-02, which requires lessees to recognize leases with terms longer than 12 months on the balance sheet and disclose key information about leasing arrangements. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The classification criteria for distinguishing between operating and finance (previously capital) leases are substantially similar to the previous lease guidance, but with no explicit bright lines. The Company adopted the standard as of January 1, 2019, electing the transition method that allows it to apply the standard as of the adoption date and record a cumulative adjustment in retained earnings, if applicable. The Company has elected the package of practical expedients permitted under the transition guidance, which among other things, allows the Company to carry forward the historical lease classification. The new standard also provides practical expedients for an entity’s ongoing accounting. The Company has made an accounting policy to keep leases, with an initial term of 12 months, or less off of the balance sheet and recognize those lease payments in the consolidated statements of income on a straight-line basis over the lease term. The Company has also elected the practical expedient to not separate lease and non-lease components for all of its leases as the non-lease components are not significant to the overall lease costs. The adoption of this standard resulted in recognition of net lease assets and lease liabilities of $1,051,148 and $1,029,240 , respectively, on its condensed consolidated balance sheets as of January 1, 2019. The Company recorded an adjustment, net of tax, of $9,030 to retained earnings, on the adoption date, related to a deferred gain on a previous sale-leaseback transaction, which resulted in an increase in rent expense of $658 annually, as we are no longer able to recognize the gain in our consolidated statement of income as a result of the new lease standard. In addition, initial direct costs associated with its lease agreements and favorable lease assets of $26,939 were classified into right of used assets on the adoption date. The standard does not materially affect the Company's consolidated net earnings or have a notable impact on liquidity or debt-covenant compliance under the current agreements. See further discussion at Note 17, Leases . Prior to the adoption of ASC 842, the Company recognized revenue related to its senior living residency agreements in accordance with the provisions of ASC 840, Leases ("ASC 840"). Subsequent to the adoption of ASU 2016-02, Leases , lessors are required to separately recognize and measure the lease component of a contract with a customer utilizing the provisions of ASC 842 and the non-lease components utilizing the provisions of ASC 606, Revenue from Contracts with Customers . To separately account for the components, the transaction price is allocated among the components based upon the estimated stand alone selling prices of the components. Additionally, certain components of a contract which were previously included within the lease element recognized in accordance with ASC 840 prior to the adoption of ASU 2016-02 (such as common area maintenance services, other basic services, and executory costs) are recognized as non-lease components subject to the provisions of ASC 606 subsequent to the adoption of ASU 2016-02. Entities are required to recognize a cumulative effect adjustment to beginning retained earnings as of the initial application date of ASU 2016-02 for changes to amounts recognized for these certain components for the transition from ASC 840 to ASC 606. However, entities are permitted to elect the practical expedient under ASU 2018-11, Leases , allowing lessors to not separate non-lease components from the associated lease components when certain criteria are met. Entities that elect to utilize the lease/non-lease component combination practical expedient under ASU 2018-11 upon initial application of ASC 842 are required to apply the practical expedient to all new and existing transactions within a class of underlying assets that qualify for the expedient as of the initial application date with a cumulative effect adjustment to beginning retained earnings as of the initial application date for any changes recognized related to existing transactions. Upon adoption of ASU 2016-02 and ASU 2018-11, the Company elected the lessor practical expedient within ASU 2018-11. The Company recognizes revenue under these resident agreements based upon the predominant component, either the lease or non-lease component, of the contracts rather than allocating the consideration and separately accounting for it under ASC Topic 842 and ASC Topic 606. The Company has concluded that the non-lease components of the agreements with respect to its senior living communities are the predominant component of the contract, therefore, the Company recognizes revenue for these residents agreements under ASC Topic 606. The timing and pattern of revenue recognition is substantially the same as that prior to the adoption of these standards. In June 2018, the FASB issued ASU 2018-07, which simplifies several aspects of the accounting for nonemployee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation-Stock Compensation, to include share-based payment transactions for acquiring goods and services from nonemployees. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The Company adopted this guidance effective January 1, 2019. The adoption of this guidance did not have a material impact on its consolidated financial statements and related disclosures. Accounting Standards Recently Issued But Not Yet Adopted by the Company In August 2018, the FASB issued amended guidance to simplify fair value measurement disclosure requirements. The new provisions eliminate the requirements to disclose (1) transfers between Level 1 and Level 2 of the fair value hierarchy, (2) policies related to valuation processes and the timing of transfers between levels of the fair value hierarchy, and (3) net asset value disclosure of estimates of timing of future liquidity events. The FASB also modified disclosure requirements of Level 3 fair value measurements. This guidance is effective for annual periods beginning after December 15, 2019, which will be the Company's fiscal year 2020, with early adoption permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial statements. In January 2017, the FASB issued amended authoritative guidance to simplify and reduce the cost and complexity of the goodwill impairment test. The new provisions eliminate step 2 from the goodwill impairment test and shifts the concept of impairment from a measure of loss when comparing the implied fair value of goodwill to its carrying amount to comparing the fair value of a reporting unit with its carrying amount. The FASB also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment or step 2 of the goodwill impairment test. The new guidance does not amend the optional qualitative assessment of goodwill impairment. This guidance is effective for annual periods beginning after December 15, 2019, which will be the Company's fiscal year 2020, with early adoption permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial statements. |