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Significant accounting policies line items.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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No definition available.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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No definition available.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Indicates line item in statement of financial position that includes current operating lease liability.

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Amount of lessee's right to use underlying asset under operating lease.

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Indicates line item in statement of financial position that includes operating lease right-of-use asset.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) country	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Total revenue	$ 50,841,000	$ 54,866,000	$ 54,277,000	$ 52,642,000	$ 48,510,000	$ 49,071,000	$ 48,727,000	$ 47,406,000	$ 212,626,000	$ 193,714,000	$ 175,642,000
Impairment of franchise agreements and other intangible assets subject to amortization									0	0	0
Impairment of goodwill									$ 0	0	0
Equity-based compensation vesting period									3 years
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									$ 6,300,000
Minimum
Significant Accounting Policies [Line Items]
Number of countries and territories operations conducted \| country									110
Software \| Minimum
Significant Accounting Policies [Line Items]
Useful life of intangible assets									3 years
Software \| Maximum
Significant Accounting Policies [Line Items]
Useful life of intangible assets									5 years
Accounts Receivable \| Prime plus
Significant Accounting Policies [Line Items]
Accounts and notes receivable interest rate percentage	2.00%								2.00%
Continuing franchise fees
Significant Accounting Policies [Line Items]
Total revenue									$ 101,104,000	93,694,000	81,197,000
Annual dues
Significant Accounting Policies [Line Items]
Total revenue									35,894,000	33,767,000	32,653,000
Broker fees
Significant Accounting Policies [Line Items]
Total revenue									46,871,000	43,801,000	37,209,000
Franchise sales and other revenue
Significant Accounting Policies [Line Items]
Total revenue									$ 28,757,000	$ 22,452,000	24,471,000
Brokerage revenue
Significant Accounting Policies [Line Items]
Total revenue											$ 112,000
Forecast \| ASU 2016-02
Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset												$ 54,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]												Assets
Operating Lease, Liability												$ 54,000,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]												Liabilities