Other Long-Term Liabilities (Other Long-Term Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018		Dec. 31, 2017
Schedule of Other Liabilities [Line Items]
Accrued lease liability	$ 10,700		$ 10,700
Accrued Bonuses	2,210		1,729
Uncertain tax position	31,410		30,682
Deferred Tax Liabilities, Net, Noncurrent	11,614		1,208
Dividends Payable	45		47
Liabilities, Other than Long-term Debt, Noncurrent	56,388	[1]	44,709	[2]
Total	$ 409		$ 343

[1] unaudited

[2] Note 1