Represents the maximum amount of employer’s matching contribution per pay period on the eligible employee compensation.

No definition available.

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- Definition

Provident fund contribution percentage on portion of employee's salary.

+ References

No definition available.

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- Definition

Share based payment award's contractual term per the terms of the agreement.

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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

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

+ References

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- Definition

Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

+ References

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- Definition

Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

+ References

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of defined benefit plan cost (credit), classified as other.

+ References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Amount of expense for salary and wage arising from service rendered by nonofficer employee. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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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.

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Employee Compensation and Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Provident fund contribution percentage on portion of employees salary	12.00%
Contributions to 401(k)	$ 4,800,000	$ 5,300,000	$ 4,900,000
Net periodic benefit cost	400,000
Future expected benefit payments, 2019	2,700,000
Future expected benefit payments, 2020 through 2021	2,800,000
Future expected benefit payments, 2022 through 2023	2,700,000
Future expected benefit payments, 2024 through 2028	15,400,000
Contributions to defined benefit pension plans	200,000	100,000	100,000
Compensation expense recognized	$ 20,500,000	$ 24,500,000	$ 25,500,000
Common stock remaining available for future issuance (in shares)	7,917,804
Contractual term of all options granted	10 years
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee contributions	50.00%
Employer match limit, percent of employee compensation	2.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee contributions	100.00%
Employer match limit, percent of employee compensation	4.00%
Matching Compensation Per Pay Period	$ 10,800
Stock Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation costs related to non-vested stock options	$ 900,000
Weighted average remaining requisite service period	2 years 6 months 21 days
Restricted Stock Units [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average remaining requisite service period	2 years 5 months 16 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 5,000,000