Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash equivalents	$ 96,500	$ 48,620
Total assets measured at fair value	181,756	129,335
Level 1
Assets
Cash equivalents	96,500	48,620
Total assets measured at fair value	179,015	129,335
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	2,741	0
Consolidated investment products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	217,708	14,449
Derivatives		4
Total assets measured at fair value	1,813,435	503,495
Liabilities
Notes payable	1,455,932	328,761
Derivatives	2	300
Short sales	751	649
Total liabilities measured at fair value	1,456,685	329,710
Consolidated investment products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	1,560,551	448,564
Consolidated investment products \| Fair Value, Measurements, Recurring \| Equity securities
Assets
Investments	35,176	40,478
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	217,708	14,449
Derivatives		4
Total assets measured at fair value	252,322	54,723
Liabilities
Notes payable	0	0
Derivatives	2	3
Short sales	751	649
Total liabilities measured at fair value	753	652
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments	0	0
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity securities
Assets
Investments	34,614	40,270
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	1,511,791	448,685
Liabilities
Notes payable	1,455,932	328,761
Derivatives	0	235
Short sales	0	0
Total liabilities measured at fair value	1,455,932	328,996
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	1,511,791	448,477
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity securities
Assets
Investments	0	208
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	49,322	87
Liabilities
Notes payable	0	0
Derivatives	0	62
Short sales	0	0
Total liabilities measured at fair value	0	62
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3 \| Debt investments
Assets
Investments	48,760	87
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity securities
Assets
Investments	$ 562	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of obligations incurred from short sales.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of notes payable.

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