Commitments and Contingencies - Additional Information (Details) shares in Thousands, ¥ in Billions	2 Months Ended	3 Months Ended		6 Months Ended
	May 03, 2019 USD ($)	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($)	Feb. 29, 2020 USD ($)	Jul. 26, 2019 USD ($)	Apr. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 JPY (¥)	Jun. 24, 2016 USD ($)	Nov. 16, 2015 public_offering	Jul. 31, 2015 USD ($) shares
Other Commitments [Line Items]
Unfunded Commitments for Capital Contributions		$ 13,737,000		$ 13,737,000
Short-Term Borrowings				0	$ 30,000,000
Cash Paid For Contingent Consideration				81,000	2,008,000
Business Combination, Contingent Consideration, Liability		215,000		215,000
Asset Acquisition, Contingent Consideration, Liability			$ 4,463,000		4,463,000
Derivative Asset, Notional Amount						$ 38,908,000		$ 14,815,000
Margin Deposit Assets								$ 680,000
Derivative, Gain (Loss) on Derivative, Net		$ 5,230,000	$ 59,000	$ (3,998,000)	$ 59,000
Number of Foreign Currency Derivatives Held | contract		0		0
Number of Public Offerings | public_offering												4
Underwritten Shares (in shares) | shares													293
Aggregate Offering Price													$ 30,800,000
Foreign Exchange Forward [Member]
Other Commitments [Line Items]
Derivative Asset, Notional Amount									$ 35,598,000	¥ 3.8
BBVA Bancomer [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity		$ 6,519,000		$ 6,519,000
BBVA Bancomer [Member] | Inter-Bank Balance Interest Rate [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.10%
Secured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity											$ 30,000,000
Amount Outstanding During Period	$ 30,000,000
Secured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.25%
Unsecured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity							$ 20,000,000
Unsecured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.50%