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Percentage of bonus which is payable in cash.

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Percentage of bonus which is payable in performance-vesting restricted units based on the Company's achievement of performance goals.

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Percentage of performance units eligible to vest per year.

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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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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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 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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of share-based compensation awards.

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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 3,198	$ 7,545
Recognized equity-based compensation expense		$ 4,500
Weighted average grant-date fair value of stock options	$ 8.45
Long-Term Incentive Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage, per year	33.00%
Long-Term Incentive Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting terms	Upon achievement of the performance goals, only 50% of the award for a given level of performance will vest, with the remaining 50% subject to a one-year performance test period. The goal achieved must be met again or exceeded the next fiscal year before the remaining units are earned.
Long-Term Incentive Time Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage, per year	33.00%
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance, gross	15,000,000
Shares available for future issuance	8,520,000
2019 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by cash	50.00%
2019 Bonus Plan [Member] \| Bonus Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by units	50.00%
2019 Bonus Plan [Member] \| Below Threshold Performance Bonus Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year	0.00%
2019 Bonus Plan [Member] \| At or Above Maximum Performance Bonus Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year	200.00%
2019 Long-Term Incentive Plan [Member] \| Long-Term Incentive Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
2019 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%
2019 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	100.00%