Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Total	$ 168,500
UNITED STATES
Defined Benefit Plan Disclosure
Total	166,932	$ 144,301	$ 324,506
UNITED STATES | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	1,610	1,449
UNITED STATES | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	165,322	142,852
UNITED STATES | Corporate Debt Securities
Defined Benefit Plan Disclosure
Total	133,792	115,424
UNITED STATES | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	133,792	115,424
UNITED STATES | US Government Debt Securities
Defined Benefit Plan Disclosure
Total	23,186	20,176
UNITED STATES | US Government Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	23,186	20,176
UNITED STATES | Global equity Securities
Defined Benefit Plan Disclosure
Total	8,344	7,252
UNITED STATES | Global equity Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	8,344	7,252
UNITED STATES | Cash and Cash Equivalents
Defined Benefit Plan Disclosure
Total	1,610	1,449
UNITED STATES | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	1,610	1,449
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	1,586	1,400	$ 1,307
Foreign Pension Plans, Defined Benefit | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	1,586	1,400
Foreign Pension Plans, Defined Benefit | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure
Total	1,586	1,400
Foreign Pension Plans, Defined Benefit | Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	1,586	1,400
Foreign Pension Plans, Defined Benefit | Other | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure
Total	$ 1,586	$ 1,400