Line items represent reporting 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
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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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-Publisher FASB
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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Amount of gain (loss) realized from securities classified as trading.

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Investments - Additional Information (Detail) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Apr. 09, 2013
Investment [Line Items]
Realized (loss) gain on trading securities	$ (300)	$ 400	$ 8,200
Investment in equity method investment			5,000
Capital contributions to equity method investments	$ 2,500
Percentage of noncontrolling equity interest acquired	50.00%
Realized gain on sale of equity method investment	$ 2,883	$ 0	0
Kleinwort Benson Investors International, Ltd. [Member]
Investment [Line Items]
Capital contributions to equity method investments			3,400	€ 2.6
Percentage of noncontrolling equity interest acquired					24.00%
Realized gain on sale of equity method investment	2,900
Capital commitments [Member]
Investment [Line Items]
Future capital commitment (up to)	$ 2,300		$ 5,000