| Basis of Presentation and Significant Accounting Policies [Text Block] | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation — The accompanying interim financial statements (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 shareholder of various consolidated limited liability companies and corporations established to operate various acquired skilled nursing and assisted living operations, home health, hospice and home care operations, urgent care centers 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 interest within the equity section of its consolidated balance sheets. The Company presents the amount of condensed consolidated net income that is attributable to The Ensign Group, Inc. and the noncontrolling interest in its condensed consolidated statements of income. 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 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, allowance for doubtful accounts, 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 — The Company recognizes revenue when the following four conditions have been met: (i) there is persuasive evidence that an arrangement exists; (ii) delivery has occurred or service has been rendered; (iii) the price is fixed or determinable; and (iv) collection is reasonably assured. The Company's revenue is derived primarily from providing healthcare services to patients and is recognized on the date services are provided at amounts billable to the individual. For reimbursement arrangements with third-party payors, including Medicaid, Medicare and private insurers, revenue is recorded based on contractually agreed-upon amounts on a per patient basis. Revenue from the Medicare and Medicaid programs accounted for 68.2% , and 66.8% of the Company's revenue for the three months ended March 31, 2017 and 2016 , respectively. The Company records revenue from these governmental and managed care programs as services are performed at their expected net realizable amounts under these programs. The Company’s revenue from governmental and managed care programs is subject to audit and retroactive adjustment by governmental and third-party agencies. Consistent with healthcare industry accounting practices, any changes to these governmental revenue estimates are recorded in the period the change or adjustment becomes known based on final settlement. The Company recorded adjustments to revenue which were not material to the Company's consolidated revenue for the three months ended March 31, 2017 and 2016 . The Company’s service specific revenue recognition policies are as follows: Skilled Nursing Revenue The Company’s revenue is derived primarily from providing long-term healthcare services to patients and is recognized on the date services are provided at amounts billable to individual patients. For patients under reimbursement arrangements with third-party payors, including Medicaid, Medicare and private insurers, revenue is recorded based on contractually agreed-upon amounts or rate on a per patient, daily basis or as services are performed. Assisted and Independent Living Revenue The Company's revenue is recorded when services are rendered on the date services are provided at amounts billable to individual residents and consists of fees for basic housing and assisted living care. Residency agreements are generally for a term of 30 days, with resident fees billed monthly in advance. For patients under reimbursement arrangements with Medicaid, revenue is recorded based on contractually agreed-upon amounts or rate on a per resident, daily basis or as services. Revenue for certain ancillary charges is recognized as services are provided, and such fees are billed monthly in arrears. Home Health Revenue Medicare Revenue Net service revenue is recorded under the Medicare prospective payment system based on a 60-day episode payment rate that is subject to adjustment based on certain variables including, but not limited to: (a) an outlier payment if patient care was unusually costly; (b) a low utilization payment adjustment if the number of visits was fewer than five; (c) a partial payment if the patient transferred to another provider or the Company received a patient from another provider before completing the episode; (d) a payment adjustment based upon the level of therapy services required; (e) the number of episodes of care provided to a patient, regardless of whether the same home health provider provided care for the entire series of episodes; (f) changes in the base episode payments established by the Medicare program; (g) adjustments to the base episode payments for case mix and geographic wages; and (h) recoveries of overpayments. The Company makes adjustments to Medicare revenue on completed episodes to reflect differences between estimated and actual payment amounts, an inability to obtain appropriate billing documentation or authorizations acceptable to the payor and other reasons unrelated to credit risk. Therefore, the Company believes that its reported net service revenue and patient accounts receivable will be the net amounts to be realized from Medicare for services rendered. In addition to revenue recognized on completed episodes, the Company also recognizes a portion of revenue associated with episodes in progress. Episodes in progress are 60-day episodes of care that begin during the reporting period, but were not completed as of the end of the period. As such, the Company estimates revenue and recognizes it on a daily basis. The primary factors underlying this estimate are the number of episodes in progress at the end of the reporting period, expected Medicare revenue per episode and its estimate of the average percentage complete based on visits performed. Non-Medicare Revenue Episodic Based Revenue - The Company recognizes revenue in a similar manner as it recognizes Medicare revenue for episodic-based rates that are paid by other insurance carriers, including Medicare Advantage programs; however, these rates can vary based upon the negotiated terms. Non-episodic Based Revenue - Revenue is recorded on an accrual basis based upon the date of service at amounts equal to its established or estimated per-visit rates, as applicable. Hospice Revenue Revenue is recorded on an accrual basis based upon the date of service at amounts equal to the estimated payment rates. The estimated payment rates are daily rates for each of the levels of care the Company delivers. The Company makes adjustments to revenue for an inability to obtain appropriate billing documentation or authorizations acceptable to the payor and other reasons unrelated to credit risk. Additionally, as Medicare hospice revenue is subject to an inpatient cap limit and an overall payment cap, the Company monitors its provider numbers and estimates amounts due back to Medicare if a cap has been exceeded. The Company records these adjustments as a reduction to revenue and increases other accrued liabilities. 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. Estimated provisions for doubtful accounts are recorded to the extent it is probable that a portion or all of a particular account will not be collected. In evaluating the collectability of accounts receivable, the Company considers a number of factors, including the age of the accounts, changes in collection patterns, the composition of patient accounts by payor type and the status of ongoing disputes with third-party payors. On an annual basis, the historical collection percentages are reviewed by payor and by state and are updated to reflect the recent collection experience of the Company. In order to determine the appropriate reserve rate percentages which ultimately establish the allowance, the Company analyzes historical cash collection patterns by payor and by state. The percentages applied to the aged receivable balances are based on the Company’s historical experience and time limits, if any, for managed care, Medicare, Medicaid and other payors. The Company periodically refines its estimates of the allowance for doubtful accounts based on experience with the estimation process and changes in circumstances. 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 $111 and $137 related to the closure of facilities during the three months ended March 31, 2017 and 2016, respectively. Intangible Assets and Goodwill — Definite-lived intangible assets consist primarily of favorable leases, lease acquisition costs, patient base, facility trade names and customer relationships. Favorable leases and lease acquisition costs are amortized over the life of the lease of the facility. Patient base is amortized over a period of four to eight months, depending on the classification of the patients and the level of occupancy in a new acquisition on the acquisition date. 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. 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. For claims made after January 1, 2017, the combined self-insured retention was $500 per claim, subject to an additional one-time deductible of $750 for California affiliated facilities and a separate, one-time, deductible of $1,000 for non-California facilities. For all affiliated facilities, except those located in Colorado, the third-party coverage above these limits was $1,000 per claim, $3,000 per facility, 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 was $1,000 per claim and $3,000 per facility for skilled nursing facilities, 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 and Washington for workers' compensation) are self-insured through the Captive, the related assets and liabilities of which are included in the accompanying consolidated balance sheets. The Captive is subject to certain statutory requirements as an insurance provider. These requirements include, but are not limited to, maintaining statutory capital. 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 $36,646 and $34,735 as of March 31, 2017 and December 31, 2016 , 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, effective February 1, 2011, the Company has purchased individual stop-loss coverage that insures individual claims that exceed $750 per occurrence. As of July 1, 2014, the Company’s operating subsidiaries in all other states, with the exception of Washington, are under a loss sensitive plan that insures individual claims that exceed $350 per occurrence. In Washington, the operating subsidiaries' coverage is financed through premiums paid by the employers and employees. The claims and pay benefits are managed through a state insurance pool. Outside of California, Texas and Washington, the Company has purchased insurance coverage that insures individual claims that exceed $350 per accident. In all states except Washington, 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 $21,743 and $20,873 as of March 31, 2017 and December 31, 2016 , respectively. In addition, the Company has recorded an asset and equal liability of $4,473 and $4,104 at March 31, 2017 and December 31, 2016 , 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 $4,426 and $5,639 as of March 31, 2017 and December 31, 2016 , 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 consolidated balance sheets. The Company presents the noncontrolling interest and the amount of consolidated net income attributable to The Ensign Group, Inc. in its 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. Stock-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. Leases and Leasehold Improvements - At the inception of each lease, the Company performs an evaluation to determine whether the lease should be classified as an operating or capital lease. The Company records rent expense for operating leases that contain scheduled rent increases 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 used for this evaluation also provides the basis for establishing depreciable lives for buildings subject to lease and leasehold improvements, as well as the period over which the Company records straight-line rent expense. 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 March 2016, the FASB issued a new standard to simplify several aspects of the accounting for employee share-based payment transactions, which includes the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The new standard was effective for the Company in the first quarter of fiscal year 2017. Under the previous guidance, excess tax benefits and deficiencies from share-based compensation arrangements were recorded in equity when the awards vested or were settled. The new guidance requires prospective recognition of excess tax benefits and deficiencies in the income statement, resulting in the recognition of excess tax benefits in income tax expense, rather than in paid-in-capital, for the three months ended March 31, 2017 . In addition, under the new guidance, excess income tax benefits from share-based compensation arrangements are classified as cash flow from operations, rather than as cash flow from financing activities. The Company has elected to apply the cash flow classification guidance prospectively, resulting in an increase to operating cash flow for the three months ended March 31, 2017 , and the prior year period has not been adjusted. The Company has also elected to continue to estimate the expected forfeitures rather than electing to account for forfeitures as they occur. Finally, the adoption of the guidance requires excess tax benefits and deficiencies to be prospectively excluded from assumed future proceeds in the calculation of diluted shares, resulting in an increase in diluted weighted average shares outstanding. Accounting Standards Recently Issued But Not Yet Adopted by the Company In January 2017, the FASB issued amended authoritative guidance to clarify the definition of a business and reduce diversity in practice related to the evaluation of whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new provisions provide the requirements needed for an integrated set of assets and activities (the set) to be a business and also establish a practical way to determine when a set is not a business. The more robust framework helps entities to narrow the definition of outputs created by the set and align it with how outputs are described in the new revenue standard. This guidance is effective for annual and interim periods beginning after December 15, 2017, which will be the Company's fiscal year 2018, with early adoption permitted in certain cases. 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 the 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 Board 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. 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 August 2016, the FASB issued amended authoritative guidance to reduce the diversity in practice related to the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. The new provisions target cash flow issues related to (i) debt prepayment or debt extinguishment costs, (ii) settlement of debt instruments with coupon rates that are insignificant relative to effective interest rates, (iii) contingent consideration payments made after a business combination, (iv) proceeds from settlement of insurance claims, (v) proceeds from the settlement of corporate-owned life insurance and bank-owned life insurance policies, (vi) distributions received from equity method investees, (vii) beneficial interests in securitization transactions and (viii) separately identifiable cash flows and application of the predominance principle. This guidance will be effective for fiscal years beginning after December 15, 2017, which will be the Company's fiscal year 2018, 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 March 2016, the FASB issued its standard to amend the principal-versus-agent implementation guidance and illustrations in the Board’s new revenue standard, which includes accounting implication related to (1) determining the appropriate unit of account under the revenue standard’s principal-versus-agent guidance and (2) applying the indicators of whether an entity is a principal or an agent in accordance with the revenue standard’s control principle. The guidance will be effective for fiscal years beginning after December 15, 2017, which will be the Company's fiscal year 2018. The guidance has the same effective date as the new revenue standard and the Company is required to adopt the guidance by using the same transition method it would use to adopt the new revenue standard. The Company's evaluation of the adoption method and impact to the consolidated financial statements is ongoing and being performed concurrently with the new revenue standard. In February 2016, the FASB issued amended authoritative guidance on accounting for leases. The new provisions require that a lessee of operating leases recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The lease liability will be equal to the present value of lease payments, with the right-of-use asset based upon the lease liability. The classification criteria for distinguishing between finance (or capital) leases and operating leases are substantially similar to the previous lease guidance, but with no explicit bright lines. As such, operating leases will result in straight-line rent expense similar to current practice. For short term leases (term of 12 months or less), a lessee is permitted to make an accounting election not to recognize lease assets and lease liabilities, which would generally result in lease expense being recognized on a straight-line basis over the lease term. This guidance applies to all entities and is effective for annual periods beginning after December 15, 2018, which will be the Company's fiscal year 2019, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements but expects this adoption will result in a significant increase in the assets and liabilities on its consolidated balance sheet. In January 2016, the FASB issued amended authoritative guidance which makes targeted improvements for financial instruments. The new provisions impact certain aspects of recognition, measurement, presentation and disclosure requirements of financial instruments. Specifically, the guidance will (1) require equity investments to be measured at fair value with changes in fair value recognized in net income, (2) simplify the impairment assessment of equity investments without readily determinable fair values, (3) eliminate the requirement to disclose the method and assumptions used to estimate fair value for financial instruments measured at amortized cost, and (4) require separate presentation of financial assets and financial liabilities by measurement category. The guidance is effective for annual and interim periods beginning after December 15, 2017, which will be the Company's fiscal year 2018. Early adoption is not permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB and International Accounting Standards Board issued their final standard on revenue from contracts with customers that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The new standard supersedes most current revenue recognition guidance, including industry-specific guidance, and may be applied retrospectively to each period presented (full retrospective method) or retrospectively with the cumulative effect recognized in beginning retained earnings as of the date of adoption (modified retrospective method). In July 2015, the FASB formally deferred for one year the effective date of the new revenue standard and decided to permit entities to early adopt the standard. In December 2016, the FASB made certain technical corrections to further clarify the core revenue recognition principles, primarily in response to feedback from several sources, including the FASB/IASB Transition Resource Group. The guidance will be effective for fiscal years beginning after December 15, 2017, which will be the Company's fiscal year 2018. The Company initiated an adoption plan in fiscal year 2015, beginning with preliminary evaluation of the standard, and will continue by performing additional analysis of revenue streams and transactio |
