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Components of Accumulated Other Comprehensive Loss, Net (Detail) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year		$ 276,311	$ 279,493	$ 277,741	$ 279,493	$ 210,279
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		982	596	(263)	1,578	(277)
Balance at end of year		263,104	276,311	265,839	263,104	265,839
Accumulated translation adjustment:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year		(32,421)	(33,727)	(24,441)	(33,727)	(27,821)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(2,953)		(5,489)	(1,647)	(2,109)
Balance at end of year		(35,374)	(32,421)	(29,930)	(35,374)	(29,930)
Accumulated deferred gains (losses) on cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year		757	161		161	14
Amounts reclassified from accumulated other comprehensive loss		(52)			(23)	(14)
Change in unrealized gains (losses)		1,034		(263)	1,601	(263)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		982		(263)	1,578	(277)
Balance at end of year		1,739	757	(263)	1,739	(263)
Accumulated effect of retirement benefit obligations:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year		(1,037)	(1,050)	(1,500)	(1,050)	(1,518)
Amounts reclassified from accumulated other comprehensive loss	[1]	12		17	25	35
Balance at end of year		(1,025)	(1,037)	(1,483)	(1,025)	(1,483)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year		(32,701)	(34,616)	(25,941)	(34,616)	(29,325)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		982	596
Balance at end of year		$ (34,660)	$ (32,701)	$ (31,676)	$ (34,660)	$ (31,676)
[1] Amounts are recorded in selling, general and administrative expense on the condensed consolidated statements of operations.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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