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Consideration Transferred (Detail) - USD ($) $ in Thousands		12 Months Ended
	Aug. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash consideration			$ 112,795	$ 44,614
Equity consideration			247,575	$ 14,135
Working capital adjustment			$ 425
Spectrum Inc.
Business Acquisition [Line Items]
Cash consideration	$ 122,932
Equity consideration	247,575
Working capital adjustment	425
Total consideration transferred	$ 370,932

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