Stock Based Compensation - Additional Information (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($) shares
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Amended and Restated 2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance under the plan \| shares	462,113
Amended and Restated 2014 Omnibus Incentive Plan \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash awards	$ 3,210
Vesting period	3 years
Deferred compensation paid relating to 2015 grant	$ 526
Deferred compensation, percentage	76.00%
Amended and Restated 2014 Omnibus Incentive 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%
Amended and Restated 2014 Omnibus Incentive Plan \| Executive Officer \| Beginning January 1, 2015 through December 31, 2017 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Amended and Restated 2014 Omnibus Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, net	$ 4,583
Unrecognized compensation expense, net, weighted average period	1 year 9 months 18 days
Total fair value of restricted stock vested	$ 1,567
Amended and Restated 2014 Omnibus Incentive Plan \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Units granted \| shares	214,616
Units vested \| shares	54,020
Units forfeited \| shares	23,511
Total fair value of units outstanding	$ 994

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

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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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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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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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Percentage of vesting of share-based compensation awards.

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