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Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at January 1,	$ 1,096	$ 1,259	$ 1,982
Additions based on tax positions related to the current year	500	500	50
Additions for tax positions of prior years	62	47	74
Reductions for tax positions of prior years	0	0	(94)
Settlements	(105)	(710)	(753)
Balance at December 31,	$ 1,553	$ 1,096	$ 1,259

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Amount of unrecognized tax benefits.

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