Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash equivalents	$ 72,993	$ 48,620
Total assets measured at fair value	169,462	129,335
Level 1
Assets
Cash equivalents	72,993	48,620
Total assets measured at fair value	146,123	129,335
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	18,900	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	4,439	0
Consolidated investment products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	82,769	14,449
Derivatives		4
Total assets measured at fair value	1,680,521	503,495
Liabilities
Notes payable	1,457,435	328,761
Derivatives	2	300
Short sales	719	649
Total liabilities measured at fair value	1,458,156	329,710
Consolidated investment products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments and bank loans	1,561,732	448,564
Consolidated investment products \| Fair Value, Measurements, Recurring \| Equity securities
Assets
Investments and bank loans	36,020	40,478
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	82,769	14,449
Derivatives		4
Total assets measured at fair value	117,895	54,723
Liabilities
Notes payable	0	0
Derivatives	2	3
Short sales	719	649
Total liabilities measured at fair value	721	652
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments and bank loans	0	0
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity securities
Assets
Investments and bank loans	35,126	40,270
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	1,527,845	448,685
Liabilities
Notes payable	1,457,435	328,761
Derivatives	0	235
Short sales	0	0
Total liabilities measured at fair value	1,457,435	328,996
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments and bank loans	1,527,845	448,477
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity securities
Assets
Investments and bank loans	0	208
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	34,781	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 and bank loans	33,887	87
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity securities
Assets
Investments and bank loans	$ 894	$ 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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