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Share-based Compensation (Details) - USD ($)				3 Months Ended		12 Months Ended
	Apr. 21, 2015	Apr. 15, 2015	Jul. 08, 2011	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-voting common interest units outstanding (in shares)				11,512,297		12,301,067
Number of non-voting common interest units forfeited or repurchased (in shares)				788,770		729,272
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued compensation expense				$ 3,900,000	$ 4,700,000
Granted (in shares)				594,536
Granted during period, value				$ 11,300,000
Class B interests | East MIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Non-voting common interest units (formerly Class B interests)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized				0	200,000
Unrecognized share-based compensation expense				$ 0		$ 100,000
Weighted average period for compensation expense expected to be recognized				0 years		9 months 18 days
Capitalized software development costs				$ 0	10,000
Non-voting common interest units (formerly Class B interests) | East MIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization expense related to share based compensation				10,000	0
Non-voting common interest units (formerly Class A 2 profits interests)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized				0	200,000
Unrecognized share-based compensation expense				$ 0		$ 100,000
Weighted average period for compensation expense expected to be recognized				0 years		1 month 6 days
Non-voting common interest units (formerly Class A 2 profits interests) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Non-qualified stock options | 2015 Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Expiration period	10 years
Expense recognized				$ 1,400,000	$ 1,400,000
Unrecognized share-based compensation expense				$ 6,100,000		$ 7,500,000
Weighted average period for compensation expense expected to be recognized				1 year 1 month 6 days		1 year 3 months 18 days
Forfeited or repurchased (in shares)					(195,000)
Outstanding (in shares)				7,783,000	8,234,000	8,234,000
Forfeited or expired (in shares)					(195,000)
Outstanding (in shares)				7,051,000	8,039,000	7,783,000	8,234,000
Weighted Average Exercise Price Per Share
Outstanding (in dollars per share)				$ 19.00	$ 19.00	$ 19.00
Exercised (in dollars per share)				19.00
Outstanding (in dollars per share)				$ 19.00	$ 19.00	$ 19.00	$ 19.00
Activity
Exercised (in shares)				(732,000)
Weighted Average Remaining Life, outstanding
Weighted Average Remaining Life				7 years 18 days	8 years 18 days	7 years 3 months 15 days	8 years 3 months 15 days
Options Exercisable, Number of Options (in shares)				3,182,000	2,009,750	3,891,500	2,058,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)				$ 19.00	$ 19.00	$ 19.00	$ 19.00
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense				$ 34,800,000		$ 14,300,000
Weighted average period for compensation expense expected to be recognized				1 year 10 months 24 days		1 year 6 months
Restricted stock units | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized				$ 4,000,000	$ 2,600,000
Restricted stock units | 2015 Management Incentive Plan
Activity
Outstanding (in shares)				853,047	1,573,441	1,573,441
Granted (in shares)				1,044,690	0
Forfeited (in shares)				(30,626)	(95,481)
Vested (in shares)				0	0
Outstanding (in shares)				1,867,111	1,477,960	853,047	1,573,441
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding (in dollars per share)				$ 17.94	$ 18.28	$ 18.28
Granted (in dollars per share)				20.64	0.00
Forfeited (in dollars per share)				18.52	18.38
Vested (in dollars per share)				0.00	0.00
Outstanding (in dollars per share)				$ 18.85	$ 18.28	$ 17.94	$ 18.28
Restricted stock units | 2015 Management Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Additions made to capitalized computer software costs during the period.

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Amount of expense for amortization of capitalized computer software costs.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of share options (or share units) exercised during the current period.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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