Financial Instruments-Marketable Securities, Forward Currency Exchange Contracts and Interest Rate Swap Contracts - Summary of Items Measures at Fair Value on Recurring Basis (Detail) - Fair Value Measurements Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value	$ 18	$ 2,251
Total liabilities at fair value	506	533
Valla Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	200	210
Forward Currency Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value	18	91
Interest Rate Swap Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	1	2
PM Contingent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	305	321
Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value		2,160
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value		2,160
Level 1 [Member] | Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value		2,160
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value	18	91
Total liabilities at fair value	1	2
Level 2 [Member] | Forward Currency Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total current assets at fair value	18	91
Level 2 [Member] | Interest Rate Swap Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	1	2
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	505	531
Level 3 [Member] | Valla Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	200	210
Level 3 [Member] | PM Contingent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	$ 305	$ 321