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The length of the performance period related to the Long Term Incentive performance-vesting shares.

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Number of senior executives who agreed to forfeit their remaining unvested shares under the modification of award.

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Percentage of bonus which is payable in cash.

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Percentage of remaining unvested shares held by Senior executives which will forfeit under the modification of award.

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Percentage of restricted shares to vest under modification of award.

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Percentage of specified performance goal weighted to Adjusted EBITDA margin.

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Percentage of specified performance goal weighted to total revenue.

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The number of shares awarded 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). Represents total shares that could be earned under the maximum performance level of achievement for all performance periods.

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Percentage of performance shares eligible to vest per year.

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Performance goals upon achievement of which share based compensation is expected to vest.

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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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Aggregate number of common shares reserved for future issuance.

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Amount of paid and unpaid cash dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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Unrecognized cost of unvested share-based compensation awards.

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Date the subsidiary or equity investee issued or sold stock, in CCYY-MM-DD format.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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 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 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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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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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Equity-Based Compensation - Additional Information (Detail)				1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 14, 2017 shares	May 08, 2017 USD ($)	Mar. 03, 2017 shares	Apr. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 Executive $ / shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)	Dec. 31, 2017	Dec. 31, 2016 USD ($) shares	Jun. 13, 2017 shares	Apr. 01, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense \| $					$ 11,906,000		$ 2,461,000	$ 16,020,000	$ 32,051,000
Unrecognized equity compensation cost \| $							$ 38,100,000		38,100,000
Unvested shares of common stock					4,532,384			4,532,384
Accumulated dividends related to performance shares which vested during the period \| $								$ 1,270,000
2013 Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance												15,000,000
Shares available for future issuance					0			0
2017 Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance					7,048,625			7,048,625
Additional shares of authorized for issuance								0
2017 Bonus Plan [Member] \| Scenario, Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by cash										50.00%
2016 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by cash											50.00%
Long-Term Incentive Plan Below Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								0.00%
Long-Term Incentive Plan Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								50.00%
Long-Term Incentive Plan Target Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								100.00%
Long-Term Incentive Plan At or Above Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								200.00%
2.25x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense \| $									$ 27,516,000
Unvested shares of common stock													1,370,821
Accumulated dividends related to performance shares which vested during the period \| $				$ 3,400,000
2.75x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock percentage closing date								May 08, 2017
Unvested shares of common stock					628,293			628,293			1,310,726
2.75x Performance Restricted Shares [Member] \| Upon Closing of Sale [Member] \| Modification of Vesting Conditions [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense \| $		$ 8,400,000
Accumulated dividends related to performance shares which vested during the period \| $					$ 1,300,000
Percentage of restricted shares to vest						60.00%
Number of senior executives agreed to forfeit \| Executive						8
Percentage of restricted shares to forfeit by executives						40.00%
Acquisition price paid per share \| $ / shares						$ 23.00
2.75x Performance Restricted Shares [Member] \| Upon Closing of Sale [Member] \| Modification of Vesting Conditions [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense \| $					$ 8,400,000			$ 8,400,000
Bonus Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares			888,235					888,235
Unvested shares of common stock					872,056			872,056			451,289
Bonus Performance Restricted Shares [Member] \| 2017 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity grant effective date			Mar. 03, 2017
Bonus Performance Restricted Shares [Member] \| 2017 Bonus Plan [Member] \| Scenario, Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by shares										50.00%
Performance goals										Based upon the Company’s achievement of specified performance goals with respect to Fiscal 2017 Adjusted EBITDA (weighted at 50%), Total Revenue (weighted at 30%) and Adjusted EBITDA Margin (weighted at 20%).
Adjusted EBITDA performance goal weight										50.00%
Total revenue performance goal weight										30.00%
Adjusted EBITDA margin performance goal weight										20.00%
Bonus Performance Restricted Shares [Member] \| 2016 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense \| $											$ 0
Percentage of bonus payable by shares											50.00%
Below Threshold Performance Bonus Restricted Shares [Member] \| 2017 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								0.00%
Threshold Performance Bonus Restricted Shares [Member] \| 2017 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								30.00%
Target Performance Bonus Restricted Shares [Member] \| 2017 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								100.00%
At or Above Maximum Performance Bonus Restricted Shares [Member] \| 2017 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								200.00%
Long-Term Incentive Time Restricted Shares [Member] \| 2017 Long-Term Incentive Plan [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period								5 years
Long-Term Incentive Time Restricted Shares [Member] \| 2016 and 2015 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period								4 years
Vesting percentage, per year								25.00%
Long-Term Incentive Time Restricted Shares [Member] \| Third Anniversary [Member] \| 2017 Long-Term Incentive Plan [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								33.00%
Long-Term Incentive Time Restricted Shares [Member] \| Fourth Anniversary [Member] \| 2017 Long-Term Incentive Plan [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								33.00%
Long-Term Incentive Time Restricted Shares [Member] \| Fifth Anniversary [Member] \| 2017 Long-Term Incentive Plan [Member] \| Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year								33.00%
Long-Term Incentive Time Restricted Shares [Member] \| Employees [Member] \| Third Anniversary [Member] \| 2017 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period								3 years
Vesting percentage, per year								100.00%
Long-Term Incentive Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense \| $								$ 0
Granted shares								791,108
Unvested shares of common stock					964,781			964,781			212,369
Long-Term Incentive Performance Restricted Shares [Member] \| 2015 and 2016 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period								3 years
Shares earned, percentage								33.00%
Long-Term Incentive Performance Restricted Shares [Member] \| Maximum Performance [Member] \| 2016 and 2015 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awarded shares								444,568
Long-Term Incentive Performance Restricted Shares [Member] \| Fiscal 2016 [Member] \| 2016 and 2015 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares								148,190
Long-Term Incentive Performance Restricted Shares [Member] \| Fiscal 2018 [Member] \| 2016 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awarded shares								117,076
Long-Term Incentive Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period								4 years
Vesting percentage, per year								25.00%
Long-Term Incentive Options, expiration period								10 years
Time-Vesting Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares								970,696
Unvested shares of common stock					1,950,178			1,950,178			1,323,025
Time-Vesting Restricted Shares [Member] \| Other Grants [Member] \| Board Members [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares	56,232
Vesting percentage, per year	100.00%