Employee Benefit Obligations - Summary of Reconciliation of Post-Employment Obligations, Net (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Defined Benefit Plans [Abstract]
Amount not recognized due to limit on Plan Assets Ceiling	$ 49,780	$ 21,463
Contingency reserve maximum percentage	25.00%
Minimum funding required (IFRIC 14), additional liability recognized	$ 484	$ 6,079

Defined benefit obligation effect of asset ceiling and minimum funding adjustment.

No definition available.

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