Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Other assets (noncurrent)	$ 15,189	$ 313
Other liabilities (current)	0	0
Other liabilities (noncurrent)	0	(1,374)
Net amount recognized	15,189	(1,061)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Other assets (noncurrent)	0	229
Other liabilities (current)	(2,312)	(3,857)
Other liabilities (noncurrent)	(43,623)	(41,709)
Net amount recognized	$ (45,935)	$ (45,337)