Income Taxes (Narrative) (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 22, 2017	Dec. 31, 2017
Income Tax [Line Items]
US corporate income tax rate	35.00%
Corporate income tax rate effective in 2018	21.00%
Tax Cuts and Jobs Act, net tax expense (benefit)		$ 13,909
Income tax expense due to remeasurement of deferred tax assets		3,156
Tax Cuts and Jobs Act one-time transition tax expense		5,842
Local tax authorities
Income Tax [Line Items]
Deferred tax liabilities, undistributed foreign earnings		$ 4,911