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Dispositions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total proceeds from sale of business unit, net of cash sold	$ 72,509				$ 72,509
Pre-tax gain	$ 74,856		$ 74,856		74,856
Net revenues		$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Data Analytics Solutions Business [Member]
Business Acquisition [Line Items]
Net revenues						$ 12,700

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