Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

This element represents the aggregate carrying amount of all cost-method investments held by the Entity which was not evaluated for impairment. Because the fair value of cost-method investments is not readily determinable, the evaluation of whether an investment is impaired generally consists of whether an event or change in circumstances has occurred during the reporting period that may have a significant adverse effect on the fair value of the investment (an "impairment indicator"). Impairment indicators include, but are not limited to: (1) significant deterioration in the earnings performance, credit rating, asset quality, or business prospects of the investee; (2) significant adverse change in the regulatory, economic, or technological environment of the investee; (3) significant adverse change in the general market condition of either the geographic area or the industry in which the investee operates; (4) a bona fide offer to purchase (whether solicited or unsolicited), an offer by the investee to sell, or a completed auction process for the same or similar security for an amount less than the cost of the investment; or (5) factors that raise significant concerns about the investee's ability to continue as a going concern, such as negative cash flows from operations, working capital deficiencies, or noncompliance with statutory capital requirements or debt covenants.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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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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No definition available.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Equity method and other investments - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noncontrolling Interest [Line Items]
Cost method total carrying amount of equity investments	$ 12,386,000			$ 12,386,000
Equity investments in nonconsolidated businesses	240,820,000	$ 245,534,000		240,820,000
Equity investment income	(3,824,000)		$ (5,308,000)	$ 6,126,000	$ (5,456,000)
Equity Method Investment, Other than Temporary Impairment	$ 0
Parent Company And Restricted Subsidiaries
Noncontrolling Interest [Line Items]
Voting interest (in percent)	60.00%			60.00%
Current economic interest in the APAC JV, Owned by the Parent Company	73.30%			73.30%
Deconsolidated Noncontrolling Entity
Noncontrolling Interest [Line Items]
Equity investments in nonconsolidated businesses	$ 146,829,000	160,481,000		$ 146,829,000
Equity Method Investment, Other than Temporary Impairment		$ 280,066,000
Voting interest (in percent)	40.00%			40.00%
Current economic interest in the APAC JV, Owned by Other Noncontrolling Investors	26.70%			26.70%