Employee Benefit Plans - Actual Fair Values of U.S. Pension Plans (Detail) - U.S. Plans [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	$ 171,240	$ 167,947
Estimated Fair Value Measurements	171,240	167,947	$ 172,119
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	2,524	2,097
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	54,403	54,722
United States [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	80,264	77,611
International Countries [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	34,049	33,517
Quoted Prices in Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	171,240	167,947
Quoted Prices in Active Markets (Level 1) [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	2,524	2,097
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	54,403	54,722
Quoted Prices in Active Markets (Level 1) [Member] | United States [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	80,264	77,611
Quoted Prices in Active Markets (Level 1) [Member] | International Countries [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	34,049	$ 33,517
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	$ 0