Income Taxes Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued employee benefits	$ 17,462	$ 18,462
Operating loss carryovers	1,134,410	1,210,377
Pensions	64,230	61,308
Tax credit carryovers	1,497	1,270
Other	64,955	35,895
Gross deferred tax assets	1,282,554	1,327,312
Valuation allowance	(1,148,268)	(1,213,750)	$ (458,288)	$ (69,900)
Deferred tax assets	134,286	113,562
Deferred tax liabilities:
Depreciation	(349,264)	(337,503)
Intangibles	(88,934)	(88,871)
Hedge of net investment of foreign subsidiary	(23,498)	(21,854)
Other	(55,173)	(31,287)
Deferred tax liabilities	(516,869)	(479,515)
Deferred Tax Liabilities, Net	(382,583)	(365,953)
Noncurrent deferred tax assets	15,275	17,029
Noncurrent deferred tax liabilities	(397,858)	(382,982)
Deferred Tax Liabilities, Net	$ 382,583	$ 365,953