Stock Based Compensation - Additional Information (Detail) - USD ($)	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2019 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to any single participant in any calendar year	100,000
Shares available for issuance under the plan	2,455,000
2019 Omnibus Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-based award paid to a single participant in any calendar year	$ 5,000,000
Aggregate number of common stock for issuance under the plan	2,500,000
Period of years for which the 2,500,000 shares can be granted over	5 years
2019 Omnibus Incentive Plan \| Employee Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term Period	10 years
2019 Omnibus Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Now-cancelled A&R 2014 Plan \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash awards	$ 3,019,000
Deferred compensation payment	$ 708,000	$ 526,000
Deferred compensation, percentage	61.00%	76.00%
Now-cancelled A&R 2014 Plan \| Executive Officer \| Beginning January 1, 2015 through December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
Now-cancelled A&R 2014 Plan \| Minimum \| Executive Officer \| Beginning January 1, 2015 through December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Now-cancelled A&R 2014 Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, net	$ 4,127,000
Unrecognized compensation expense, net, weighted average period	2 years 1 month 6 days
Total fair value of restricted stock vested	$ 1,011,000
Restricted stock awards granted, holding period	2 years
Share based payment awards discounted for restriction of liquidity percentage	20.60%
Now-cancelled A&R 2014 Plan \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Units granted	319,892
Units vested	115,020
Units forfeited	27,862
Total fair value of units outstanding	$ 239,000

The total fair value of unvested phantom units at end of period.

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Share based compensation arrangement by share-based payment award discounted for restriction of liquidity percentage.

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Share based compensation arrangement by share based payment award equity instruments other than options holding period subsequent to vesting date.

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Share based compensation arrangement by share based payment award percentage of vesting maximum.

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The number in years which denotes the term of the stock compensation plan under which the approved maximum number of shares can be granted.

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Amount of commitment made to pay deferred cash remuneration.

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Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

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Amount of distribution made to individual in accordance with deferred compensation arrangement.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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 highest quantity of shares an employee can purchase under the plan per period.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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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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