Dividends declared and paid.

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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.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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- Definition

The month and year (YYYY-MM) that the dividend to be paid was declared.

+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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

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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- Definition

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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

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

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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No definition available.

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- Definition

Amount of stock repurchase plan authorized.

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No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' Equity and Share-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended				9 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation costs		$ 4,300,000			$ 3,800,000	$ 13,300,000	$ 11,600,000
Authorization of common stock repurchase								$ 100,000,000
Number of shares repurchased		433,000				592,000
Cost of shares repurchased		$ 31,800,000				$ 44,700,000
Fourth Quarter [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividend declared per share	$ 0.375
Dividend date of record	Dec. 15, 2015
Dividend date of declared	2015-10
Dividend payment date	Dec. 31, 2015
First Quarter [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid per share				$ 0.375
Second Quarter [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid per share			$ 0.375
Third Quarter [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid per share		$ 0.375
Share-Based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized share-based compensation cost which is expected to be recognized		$ 32,200,000				$ 32,200,000
Total compensation cost not yet recognized, period for recognition						3 years
Share-Based Compensation [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share-based compensation awards						3 years
Share-Based Compensation [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share-based compensation awards						4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance based stock awards, granted						310,000
Weighted average grant date fair value, granted						$ 74.20
Number of restricted stock units, vested						268,000
Weighted average grant date fair value, vested						$ 53.49
Performance Based Stock Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance based stock awards, granted						32,000
Weighted average grant date fair value, granted						$ 72.39