Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash equivalents	$ 73,434	$ 48,620
Total assets measured at fair value	154,901	129,335
Level 1
Assets
Cash equivalents	73,434	48,620
Total assets measured at fair value	151,992	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	2,909	0
Consolidated investment products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	48,111	14,449
Derivatives		4
Total assets measured at fair value	1,402,500	503,495
Liabilities
Notes payable	1,096,434	328,761
Derivatives	1	300
Short sales	751	649
Total liabilities measured at fair value	1,097,186	329,710
Consolidated investment products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	1,321,276	448,564
Consolidated investment products \| Fair Value, Measurements, Recurring \| Equity securities
Assets
Investments	33,113	40,478
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	48,111	14,449
Derivatives		4
Total assets measured at fair value	81,224	54,723
Liabilities
Notes payable	0	0
Derivatives	1	3
Short sales	751	649
Total liabilities measured at fair value	752	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	33,113	40,270
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	1,312,126	448,685
Liabilities
Notes payable	1,096,434	328,761
Derivatives	0	235
Short sales	0	0
Total liabilities measured at fair value	1,096,434	328,996
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	1,312,126	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	9,150	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	9,150	87
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity securities
Assets
Investments	$ 0	$ 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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