Income Taxes (Narrative) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Income Tax [Line Items]
Tax Cuts and Jobs Act, net tax expense (benefit)		$ 13,739
Income tax expense due to remeasurement of deferred tax assets	$ 5,075
Tax Cuts and Jobs Act one-time transition tax expense	6,219
Tax Cuts and Jobs Act reduction in transition tax expense	$ 405
Earliest Tax Year
Income Tax [Line Items]
US corporate income tax rate	35.00%
Latest Tax Year
Income Tax [Line Items]
US corporate income tax rate	21.00%
Local tax authorities
Income Tax [Line Items]
Deferred tax liabilities, undistributed foreign earnings	$ 2,445