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Short-Term Bank Loans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Bank	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Short-term Debt [Line Items]
Interest expense	$ 105,000	$ 0	$ 0
Number of banks | Bank	2
Line of credit	$ 95,000,000
Securities Loan	25,000,000
Pledged deposit	25,000,000
Loans payable	$ 25,000,000
Minimum
Short-term Debt [Line Items]
Interest rate	0.953%
Maximum
Short-term Debt [Line Items]
Interest rate	1.51%

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Number of banks.

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Amounts due on short-term bank loans secured by customers' securities on the balance sheet date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

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-Name Accounting Standards Codification
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-Section 50
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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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-Publisher FASB
-Name Accounting Standards Codification
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Name Accounting Standards Codification
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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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