The additional annual cash award to be given to any non-employee chairmen of the board.

No definition available.

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The additional annual cash award to be given to audit committee members.

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No definition available.

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Additional annual cash award to be given to chairperson of the audit committee.

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No definition available.

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- Definition

The amended vesting period of the annual granted shares of common stock to the non-employee directors.

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No definition available.

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The amended vesting period of the cash annual retainer to the non-employee chairman and committee members.

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No definition available.

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- Definition

The annual cash awards for the chairpersons of the compensation committee, finance committee and nominating and corporate governance committee.

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No definition available.

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The annual cash awards for the members of the compensation committee, finance committee and nominating and corporate governance committee.

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No definition available.

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The annual retainer payable in cash to non-employee directors.

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No definition available.

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The annual retainer payable in stock to non-employee directors.

+ References

No definition available.

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Common stock match associated with the deferred compensation plan carrying value.

+ References

No definition available.

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Represents the compensation cost capitalized as of the balance sheet date arising from equity-based compensation arrangements (for example, shares of stock units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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No definition available.

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- Definition

The increased additional annual cash award to the chairperson of the compensation committee.

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No definition available.

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The total increased cash component of the annual retainer.

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No definition available.

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The total increased stock component of the annual retainer.

+ References

No definition available.

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The percentage of contribution in respect of amounts deferred by certain senior management participants.

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No definition available.

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Range of vesting possibilities.

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No definition available.

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The vesting period of the share-based compensation shares.

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No definition available.

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The value of the annual retainer to non-employee directors.

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No definition available.

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- Definition

The value of the initial granted shares of common stock to new non-employee directors.

+ References

No definition available.

+ Details

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- Definition

The vesting period of the annual granted shares of common stock to the non-employee directors.

+ References

No definition available.

+ Details

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The vesting period of the initial granted shares of common stock to new non-employee directors.

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No definition available.

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Period from grant date that an equity-based award expires, 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

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Stock-Based Compensation - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	May. 20, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized stock-based compensation costs	$ 0	$ 0
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period	2 years 1 month 6 days
Total unrecognized compensation cost	$ 100,000
2011 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock available under the 2011 plan	4,000,000
2001 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2001 equity incentive plan	Mar. 14, 2011
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation plan expiration	10 years
Share-based compensation vesting period	One-third on each of the first three anniversaries of the date of grant
Weighted average period	1 year 6 months
Total unrecognized compensation cost	$ 2,800,000
Restricted Shares [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period	One-third on each of the first three anniversaries of the date of grant
Weighted average period	2 years
Total unrecognized compensation cost	$ 18,800,000
Restricted Shares [Member] \| Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of vesting possibilities	0.00%
Restricted Shares [Member] \| Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of vesting possibilities	100.00%
May 19, 2015 Nonvested Common Stock Share Awards under Non-Employee Director Fee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Retainer payable in cash to Non Employee Director	$ 55,000
Increased stock component of annual retainer	25,000
Annual Retainer payable in stock to Non Employee Director	100,000
Increased cash component of annual retainer	$ 5,000
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of contribution in respect of amounts deferred by certain senior management participants	50.00%
Vesting period of matching contributions and associated earnings	7 years
Deferred Compensation Plan [Member] \| President, Chief Executive Officer and Executive Vice Presidents [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts deferred by certain senior management personnel	$ 12,000
Deferred Compensation Plan [Member] \| Senior Vice President, Global Vice Presidents and Vice Presidents [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts deferred by certain senior management personnel	7,500
Deferred Compensation Plan [Member] \| Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock match associated with the deferred compensation plan carrying value	1,600,000	1,500,000
Deferred Compensation Plan [Member] \| Accrued employee compensation and benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued employee compensation and benefits	$ 7,700,000	$ 7,000,000
Nonvested Common Stock Share Awards under Non-Employee Director Fee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2001 equity incentive plan	May 31, 2014
Value of initial granted shares of common stock to new non employee director	$ 60,000
Vesting period of initial granted shares of common stock to new non employee director
Amended vesting period of cash Annual retainer to non-employee chairman and committee members
Vesting period of annual granted shares of common stock to non-employee director
Amended vesting period of annual granted shares of common stock to non-employee director	Four equal quarterly installments, one-fourth on the date of grant and an additional one-fourth on each successive third monthly anniversary of the date of grant
Additional annual cash award to be given to any non employee chairman of board	$ 100,000
Additional annual cash award to be given to Chairperson of the audit committee	20,000
Additional annual cash award to be given to audit committee members	10,000
Annual cash awards for the Chairpersons of the Compensation Committee, Finance Committee and Nominating and Corporate Governance Committee	12,500
Annual cash awards for the members of the Compensation Committee, Finance Committee and Nominating and Corporate Governance Committee	7,500
Increased additional annual cash award to Chairperson of Compensation Committee			$ 15,000
May 17, 2012 Nonvested Common Stock Share Awards under Non-Employee Director Fee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of Annual Retainer to Non-Employee Director	125,000
Annual Retainer payable in cash to Non Employee Director	50,000
Increased stock component of annual retainer	$ 30,000
Vesting period for the annual equity award	1 year
May 20, 2011 Nonvested Common Stock Share Awards under Non-Employee Director Fee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of Annual Retainer to Non-Employee Director	$ 95,000
Annual Retainer payable in cash to Non Employee Director	$ 50,000
Vesting period for the annual equity award	2 years
Nonvested Common Stock Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period	6 months
Total unrecognized compensation cost	$ 600,000