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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Company's Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	35.00%	35.00%
Change in valuation allowance—Foreign	6.90%	9.20%	8.20%
Non-deductible acquisition-related costs	3.00%	2.70%
Blended state income tax rate, net of federal benefit	2.80%	3.80%	4.20%
Change in valuation allowance – Capital losses	1.60%
Gain on revaluation of deferred consideration	(5.00%)
Foreign operations	(2.10%)
Stock-based compensation tax (windfalls)/shortfalls	(1.10%)	1.80%
Re-measurement of net deferred tax assets – Rate change		0.80%
Acquisition expense			4.10%
Goodwill impairment			1.20%
Other differences, net	1.10%		0.20%
Effective rate	28.20%	53.30%	52.90%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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