Commitments and Contingencies - Additional Information (Details) shares in Thousands, ¥ in Billions		2 Months Ended	3 Months Ended	12 Months Ended
	Mar. 11, 2019 USD ($)	Mar. 02, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019 JPY (¥)	Jun. 24, 2016 USD ($)	Jul. 31, 2015 USD ($) shares
Other Commitments [Line Items]
Unfunded Commitments for Capital Contributions			$ 12,910,000
Cash Paid For Contingent Consideration			2,008,000
Business Combination, Contingent Consideration, Liability			333,000
Asset Acquisition Contingent Consideration Liability			4,463,000
Asset Acquisition Contingent Consideration Arrangements Change In Amounts Of Contingent Consideration Liability				$ 3,971,000
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
Derivative Asset, Fair Value, Gross Asset			22,000
BBVA Bancomer [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity			$ 10,286,000
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	$ 30,000,000