Percentage of performance award grant in period

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of shareholder return annually

+ References

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- Definition

Percentage of shareholder return to be earned

+ References

No definition available.

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- Definition

Performance Based Award Share Amount Earned And Vested

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Earned In Period

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options additional forfeitures in period.

+ References

No definition available.

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- Definition

Shareholder Return Achieving Period

+ References

No definition available.

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (b)
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-Publisher FASB
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-Subparagraph (h)(1)(i)
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (i)
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- Definition

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.

+ References

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

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.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (f)(2)(ii)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Stock Awards - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 7.9	$ 11.1	$ 9.2
Stock-based compensation expense, unrecognized cost	$ 12.4
Stock-based compensation expense, unrecognized cost, reorganization period (in years)	2 years 9 months 11 days
Restricted equity awards, fair value	$ 12.7	$ 10.2	$ 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	5,265,916
Maximum number of shares of common stock that may be awarded	5,000,000
Service-Based Awards [Member] \| Minimum [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
Service-Based Awards [Member] \| Maximum [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
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
Percentage of performance award grant in period	50.00%
Stock-based awards expiration date	Dec. 31, 2018
Percentage of performance award to be earned of shareholder return reaches shareholder limit	100.00%
Common stock options awarded, dividend yield	7.00%
Share based payment award, weighted average risk-free rate of return	1.00%
Share based payment award, expected volatility rate	24.40%
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] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned	27.00%
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%
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
Percentage of shareholder return to be earned	3.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit	100.00%
Common stock options awarded, dividend yield	7.00%
Share based payment award, weighted average risk-free rate of return	1.00%
Share based payment award, expected volatility rate	24.40%
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	2,400
Number of performance awards earned and vested	0
Number of performance awards to be earned	797,404
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
Percentage of performance award grant in period		40.00%
Stock-based awards expiration date	Dec. 31, 2017
Common stock options awarded, dividend yield		7.20%
Share based payment award, weighted average risk-free rate of return		1.10%
Share based payment award, expected volatility rate		20.00%
Percentage of shareholder return annually		9.00%
Annual total shareholder return (in years)		3 years
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
Percentage of performance award grant in period		30.00%
Stock-based awards expiration date	Dec. 31, 2017
Percentage of performance award to be earned of shareholder return reaches shareholder limit		100.00%
Common stock options awarded, dividend yield		7.20%
Share based payment award, weighted average risk-free rate of return		1.10%
Share based payment award, expected volatility rate		20.00%
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] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned		27.00%
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%
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
Percentage of shareholder return to be earned		6.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit		100.00%
Common stock options awarded, dividend yield		7.20%
Share based payment award, weighted average risk-free rate of return		1.10%
Share based payment award, expected volatility rate		20.00%
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	66,792	4,500
Number of performance awards earned and vested	98,526	0
Number of performance awards to be earned	702,070
40% of 2014 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
Percentage of performance award grant in period			40.00%
Stock-based awards expiration date	Dec. 31, 2018
Common stock options awarded, dividend yield			8.00%
Share based payment award, weighted average risk-free rate of return			1.70%
Share based payment award, expected volatility rate			27.00%
Percentage of shareholder return annually			9.00%
Annual total shareholder return (in years)			5 years
30% of 2014 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
Percentage of performance award grant in period			30.00%
Stock-based awards expiration date	Dec. 31, 2016
Percentage of performance award to be earned of shareholder return reaches shareholder limit			100.00%
Common stock options awarded, dividend yield			8.00%
Share based payment award, weighted average risk-free rate of return			0.80%
Share based payment award, expected volatility rate			27.00%
30% of 2014 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, 2016, 2017, and 2018.
30% of 2014 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%
30% of 2014 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%
Remaining % of 2014 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, 2016
Percentage of shareholder return to be earned			6.00%
Percentage of performance award to be earned of shareholder return reaches shareholder limit			100.00%
Common stock options awarded, dividend yield			8.00%
Share based payment award, weighted average risk-free rate of return			0.80%
Share based payment award, expected volatility rate			27.00%
Remaining % of 2014 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, 2016, 2017, and 2018.
2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards forfeited	500,000
Number of performance awards earned and vested	99,959	0	108,261
Number of performance awards to be earned	99,935
Number of additional performance awards forfeited	72,003