Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
U.S. corporate income tax rate		35.00%
Provisional income tax benefit related to remeasurement of domestic net deferred tax liabilities and deferred tax assets		$ 90,965
Net provisional income tax expense related to deemed repatriation of unremitted earnings of foreign subsidiaries		$ 1,132
Scenario, Forecast [Member]
Income Taxes [Line Items]
U.S. corporate income tax rate	21.00%