Income Taxes - Income Tax Effects of Temporary Differences from Continuing Operations that Give Rise to Significant Portions of Deferred Income Tax (Liabilities) Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax liabilities:
Undistributed foreign earnings	$ (36,624)	$ (27,717)
Depreciation and amortization	(53,171)	(65,614)
Other	(11,830)	(15,346)
Total deferred income tax liabilities	(101,625)	(108,677)
Deferred income tax assets:
Net operating loss, capital loss and tax credit carryforwards	41,707	43,535
Accrued expenses and unearned income	23,315	34,048
Employee benefits	123,775	130,217
Other	12,801	17,784
Deferred Tax Assets, Gross	201,598	225,584
Valuation allowance for deferred income tax assets	(22,162)	(24,695)
Total deferred income tax assets	179,436	200,889
Net deferred income tax assets	$ 77,811	$ 92,212