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Percentage of performance award grant in period

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Percentage of performance award to be earned if proportion of general and administrative expense to revenue reaches threshold limit.

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No definition available.

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- Definition

Percentage of performance award to be earned of shareholder return reaches shareholder limit

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Percentage of shareholder return to be earned

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Performance based award share amount earned and vested.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest In Period

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Share based compensation arrangement by share based payment award equity instruments other than options not earned in period.

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Shareholder Return Achieving Period

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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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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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 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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- Definition

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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Date the equity-based award expires, in CCYY-MM-DD format.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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- Definition

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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Stock Awards - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 9.9	$ 7.9	$ 11.1
Stock-based compensation expense, unrecognized cost			$ 17.7
Stock-based compensation expense, unrecognized cost, reorganization period (in years)			2 years 11 months 23 days
Restricted equity awards, fair value			$ 10.4	$ 12.7	$ 10.2
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period in years			10 years
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for awards under the Equity Incentive Plan			8,196,770
Common stock remaining for future stock awards transferred to the equity incentive plan			3,676,000
Maximum number of shares of common stock that may be awarded			5,000,000
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)			3 years
40% of 2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)					3 years
Annual total shareholder return (in years)					3 years
Stock-based awards expiration date			Dec. 31, 2017
Percentage of performance award grant in period					40.00%
Percentage of shareholder return to be earned					9.00%
Share based payment award, weighted average risk-free rate of return					1.10%
Share based payment award, expected volatility rate					20.00%
Common stock options awarded, dividend yield					7.20%
30% of 2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)					5 years
Stock-based awards expiration date			Dec. 31, 2017
Percentage of performance award grant in period					30.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit					100.00%
Share based payment award, weighted average risk-free rate of return					1.10%
Share based payment award, expected volatility rate					20.00%
Common stock options awarded, dividend yield					7.20%
30% of 2015 Performance Awards [Member] \| If Any Shares are Earned from this Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on December 31, 2017, 2018, and 2019.
30% of 2015 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned					35.00%
30% of 2015 Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned					27.00%
Remaining % of 2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)					5 years
Stock-based awards expiration date			Dec. 31, 2017
Share based payment award, weighted average risk-free rate of return					1.10%
Share based payment award, expected volatility rate					20.00%
Common stock options awarded, dividend yield					7.20%
Remaining % of 2015 Performance Awards [Member] \| MSCI Index Plus Six Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned					6.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit					100.00%
Remaining % of 2015 Performance Awards [Member] \| If Any Shares are Earned from this Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on December 31, 2017, 2018, and 2019.
2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards forfeited			353,104	66,792	4,500
Number of performance awards to be earned			0
Number of performance awards earned and vested			348,966	98,526	0
2015 Performance Awards [Member] \| Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards to be vested	168,348	168,348
50% of 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)				5 years
Stock-based awards expiration date			Dec. 31, 2018
Percentage of performance award grant in period				50.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit				100.00%
Share based payment award, weighted average risk-free rate of return				1.00%
Share based payment award, expected volatility rate				24.40%
Common stock options awarded, dividend yield				7.00%
50% of 2016 Performance Awards [Member] \| If Any Shares are Earned from this Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on January 1, 2019, 2020, and 2021.
50% of 2016 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned				35.00%
50% of 2016 Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned				27.00%
Remaining % of 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)				5 years
Stock-based awards expiration date			Dec. 31, 2018
Share based payment award, weighted average risk-free rate of return				1.00%
Share based payment award, expected volatility rate				24.40%
Common stock options awarded, dividend yield				7.00%
Remaining % of 2016 Performance Awards [Member] \| Within Three Percent of MSCI Index [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned				3.00%
Remaining % of 2016 Performance Awards [Member] \| MSCI Index Plus Three Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned				300.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit				100.00%
Remaining % of 2016 Performance Awards [Member] \| If Any Shares are Earned from this Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on January 1, 2019, 2020, and 2021.
2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards forfeited			16,000	2,400
Number of performance awards to be earned			781,404
Number of performance awards earned and vested			0	0
42% of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)			3 years
Annual total shareholder return (in years)			1 year
Stock-based awards expiration date			Dec. 31, 2017
Percentage of performance award grant in period			42.00%
Share based payment award, weighted average risk-free rate of return			1.00%
Share based payment award, expected volatility rate			25.00%
Common stock options awarded, dividend yield			6.90%
42% of 2017 Performance Awards [Member] \| U.S. REIT Healthcare Index Minus 3% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			3.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			50.00%
42% of 2017 Performance Awards [Member] \| U.S. REIT Healthcare Index Plus 3% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			3.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			200.00%
47% of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual total shareholder return (in years)			1 year
Stock-based awards expiration date			Dec. 31, 2017
Percentage of performance award grant in period			47.00%
47% of 2017 Performance Awards [Member] \| Return on Equity Equal to 12.5% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			12.50%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			50.00%
47% of 2017 Performance Awards [Member] \| Return on Equity Greater than or Equal to 13.5% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			13.50%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			200.00%
11% of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual total shareholder return (in years)			1 year
Stock-based awards expiration date			Dec. 31, 2017
Percentage of performance award to be earned of shareholder return reaches shareholder limit			11.00%
11% of 2017 Performance Awards [Member] \| General and Administrative Expense to Revenue Ratio Equal to 10% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance award to be earned if G&A stays at or below limit			50.00%
11% of 2017 Performance Awards [Member] \| General and Administrative Expense to Revenue Ratio is Less Than Equal to 9% [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
G&A as a percentage of revenue threshold			9.00%
Percentage of performance award to be earned if G&A stays at or below limit			200.00%
11% of 2017 Performance Awards [Member] \| General and Administrative Expenses to Revenue Ratio Less Than Equal to Ten Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
G&A as a percentage of revenue threshold			10.00%
Final Portion of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)			3 years
Stock-based awards expiration date			Dec. 31, 2019
Share based payment award, weighted average risk-free rate of return			1.50%
Share based payment award, expected volatility rate			25.00%
Common stock options awarded, dividend yield			6.90%
Share-based compensation award vesting rights			Vest in equal annual amounts on January 1, 2020, 2021, and 2022.
Final Portion of 2017 Performance Awards [Member] \| SNL Index, Greater than Three Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			3.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			100.00%
2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards forfeited			14,000
Number of performance awards earned and unvested			596,472
Number of performance awards to be earned			1,130,531
65% of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award, expected service period (in years)			5 years
Share based payment award, weighted average risk-free rate of return			1.90%
Share based payment award, expected volatility rate			25.00%
Common stock options awarded, dividend yield			6.90%
65% of 2017 Performance Awards [Member] \| 2019 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards expiration date			Dec. 31, 2019
Percentage of performance award to be earned of shareholder return reaches shareholder limit			30.00%
65% of 2017 Performance Awards [Member] \| 2020 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards expiration date			Dec. 31, 2020
Percentage of performance award to be earned of shareholder return reaches shareholder limit			30.00%
65% of 2017 Performance Awards [Member] \| 2019 and 2020 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards expiration date			Dec. 31, 2021
65% of 2017 Performance Awards [Member] \| Maximum [Member] \| 2019 and 2020 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance award to be earned of shareholder return reaches shareholder limit			30.00%
65% of 2017 Performance Awards [Member] \| Minimum [Member] \| 2019 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			27.00%
65% of 2017 Performance Awards [Member] \| Minimum [Member] \| 2020 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			36.00%
65% of 2017 Performance Awards [Member] \| Minimum [Member] \| 2019 and 2020 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			45.00%
20% of 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual total shareholder return (in years)			1 year