Basis of presentation.

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Assets or liabilities transferred into or out of levels I, II or III during the reporting period.

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Number of annual capital repayments to limited partners withdrawing from the partnership.

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The minimum annual return rate on the face amount of limited partnership capital.

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Minimum period to receive distribution by limited partners.

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Minimum period to receive distribution by subordinated limited partners.

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Number of classes of capital in the partnership.

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Partnership agreement partners capital redemption period.

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The amount of revenue during the reporting period derived from one mutual fund company.

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Retirement transition employment agreement term.

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Retirement transition plan accrued future payments.

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Retirement transition plan accrued future payments expected to be paid.

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- Definition

Term for compensation expense recognition under the retirement transition plan.

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- Definition

Retirement transition plan compensation on transitioned assets term.

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Term for compensation paid under the retirement transition plan, which is made ratably over the period.

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Term as employee under the retirement transition plan.

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Term for non-compete agreement under the retirement transition plan.

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- Definition

Securities purchased under agreements to resell fair value of underlying collateral percentage.

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No definition available.

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- Definition

Number of annual capital repayments to subordinated limited partners withdrawing from the partnership.

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- Definition

Assets categorized as level III during the reporting period.

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Liabilities categorized as level III during the reporting period.

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- Definition

Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Segment Capital_Repayment CapitalClass	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($) Segment
Basis Of Presentation [Line Items]
Number of operating segments \| Segment	2	2	2
Period for partner's capital redemption in the event of death	6 months
Number of annual capital repayments for withdrawal of limited partners \| Segment	3
Period to begin repaying capital upon withdrawal for limited partners	90 days
Number of annual capital repayments for withdrawal of subordinated limited partners \| Capital_Repayment	6
Period to begin repaying capital upon withdrawal for subordinated limited partners	90 days
Partnership's total revenue derived from one mutual fund company	19.00%	20.00%	20.00%
Fair value of level III, assets	$ 0	$ 0
Fair value of level III, liabilities	0	0
Transfers between levels I, II and III	0	0
Fair value of collateral related to resell agreements	$ 907,000,000	858,000,000
Retirement and transition employment agreement term	5 years
Retirement transition plan employment term	2 years
Retirement transition plan non-compete term	3 years
Retirement transition plan compensation paid term	4 years
Retirement transition plan accrued future payments	$ 59,000,000
Retirement transition plan accrued future payments expected to be paid in 2017	26,000,000
Net income	$ 0	$ 0	$ 0
Number of classes of capital \| CapitalClass	3
Limited partnership's minimum annual return rate	7.50%	7.50%	7.50%
Building [Member]
Basis Of Presentation [Line Items]
Equipment, property and improvements estimated useful lives	30 years
Minimum [Member]
Basis Of Presentation [Line Items]
Retirement transition plan compensation expense term	1 year
Minimum [Member] \| Equipment [Member]
Basis Of Presentation [Line Items]
Equipment, property and improvements estimated useful lives	3 years
Minimum [Member] \| United States [Member]
Basis Of Presentation [Line Items]
Fair value of underlying collateral as percentage of carrying value of transaction	102.00%	102.00%
Minimum [Member] \| Canada [Member]
Basis Of Presentation [Line Items]
Fair value of underlying collateral as percentage of carrying value of transaction	100.00%	100.00%
Maximum [Member]
Basis Of Presentation [Line Items]
Retirement transition plan compensation expense term	2 years
Retirement transition plan compensation on transitioned assets term	4 years
Maximum [Member] \| Equipment [Member]
Basis Of Presentation [Line Items]
Equipment, property and improvements estimated useful lives	7 years
Securities Purchase Agreement [Member] \| Minimum [Member] \| United States [Member]
Basis Of Presentation [Line Items]
Fair value of underlying collateral as percentage of carrying value of transaction	102.00%
Securities Purchase Agreement [Member] \| Minimum [Member] \| Canada [Member]
Basis Of Presentation [Line Items]
Fair value of underlying collateral as percentage of carrying value of transaction	100.00%