Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Date the subsidiary or equity investee issued or sold stock, in CCYY-MM-DD format.

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Related-Party Transactions - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	May 08, 2017	Mar. 31, 2018	Dec. 31, 2017
ZHG Stock Purchase Agreement [Member]
Related Party Transaction [Line Items]
Reimbursement for cost and expenses incurred by company relating to sale			$ 4,000,000
Revenue recognized		$ 1,300,000
Receivable from related party		$ 3,200,000
Stock Purchase Agreement [Member] \| ZHG Group [Member]
Related Party Transaction [Line Items]
Sale of stock percentage closing date	May 08, 2017
Percentage of common stock outstanding by partnership	21.00%