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Equity Method Investment Voting Ownership Percentage

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Fair Value Inputs, Sales Restrictions, Period

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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

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Amount of the effect of a change in accounting principle on diluted earnings per share.

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Amount of the effect of a change in accounting principle on net income.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Lower Limit
Significant Accounting Policies [Line Items]
Marketability discount			10.00%
Duration of the sale restrictions			3 months
Upper Limit
Significant Accounting Policies [Line Items]
Marketability discount			20.00%
Duration of the sale restrictions			6 months
Percentage of voting interest held by the company for investments accounted for under the equity method			5.00%	5.00%
Investments in limited partnerships \| Lower Limit
Significant Accounting Policies [Line Items]
Percentage of voting interest held by the company for investments accounted for under the equity method			5.00%
Investments in limited partnerships \| Upper Limit
Significant Accounting Policies [Line Items]
Percentage of ownership interest held by the company for investments accounted for under the cost method			5.00%
Privately Held Companies \| Lower Limit
Significant Accounting Policies [Line Items]
Percentage of voting interest held by the company for investments accounted for under the equity method			20.00%
China Joint Venture investment \| Other investments \| Equity method accounting
Significant Accounting Policies [Line Items]
Ownership percentage of each Fund			50.00%	50.00%
Restatement Adjustment [Member] \| Accounting Standards Update 2016-09
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income			$ 5.5	$ 11.7
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	$ 0.00	$ 0.15	$ 0.10	$ 0.23