Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
| SARs liability | $ 1,662 | $ 1,366 |
| Deferred compensation liability | 1,261 | 607 |
| Total | 49,180 | 44,754 |
| SARs liability | 20,217 | 20,949 |
| Deferred compensation liability | 7,220 | 6,405 |
| Total | 49,361 | 44,455 |
| Current [Member] | ||
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
| Commissions payable to investment sales and financing professionals | 46,257 | 42,781 |
| Non-Current [Member] | ||
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
| Commissions payable to investment sales and financing professionals | $ 21,924 | $ 17,101 |
| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the current liabilities for deferred compensation arrangements related to Rabbi Trust, deferred commissions payable and other commissions related obligations and SARs Liability. No definition available.
|
| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements related to Rabbi Trust, deferred commissions payable and other commissions related obligations and SARs Liability. No definition available.
|
| X | ||||||||||
- Definition Aggregate carrying value (includes principal and accrued interest) as of the balance sheet date of current deferred compensation associated with Stock Appreciation Rights payable to each participant in installments upon retirement or departure under terms of the agreement. No definition available.
|
| X | ||||||||||
- Definition Aggregate carrying value (includes principal and accrued interest) as of the balance sheet date of non-current deferred compensation associated with Stock Appreciation Rights payable to each participant in installments upon retirement or departure under terms of the agreement. No definition available.
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable within one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|