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Summary of Restricted Stock Award Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock unit awards that vested during the period	149,976
Fair value of restricted shares that vested during the period	$ 5,745	$ 7,807
Compensation expense recognized during the period	2,433	2,375
Income tax benefit recognized upon vesting of restricted stock awards	$ 1,002	$ 1,399
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock unit awards that vested during the period	88,074	125,063
Fair value of restricted shares that vested during the period	$ 3,550	$ 3,594
Accumulated dividends paid upon vesting of restricted stock unit awards	375	522
Compensation expense recognized during the period	537	1,051
Income tax benefit recognized upon vesting of restricted stock awards	$ 170	$ 723

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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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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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