Income Taxes - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
Dec. 22, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory corporate tax rate		35.00%	21.00%	35.00%
Income tax benefit			$ (41,579,000)	$ (3,582,000)
Effective income tax rate			(85.80%)	(10.60%)
Measurement period	1 year
Income tax expense			$ 0
Excess tax benefits from stock-based awards			$ 53,800,000	$ 16,800,000
Potential repatriation of foreign subsidiary earnings			100.00%

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the repatriation of foreign earnings.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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