Pensions and Postretirement Benefits Other than Pensions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Expenses for Company's defined contribution plans	$ 14,236	$ 12,510	$ 12,522
Unrecognized prior service credit included in cumulative other comprehensive loss	(1,905)	(2,736)
Unrecognized prior service credit, Net of tax included in cumulative other comprehensive loss	(1,565)	(2,078)
Unrecognized actuarial losses included in cumulative other comprehensive loss	(569,639)	(647,115)
Defined benefit plan accumulated other comprehensive income net gains losses net of tax	(492,752)	(546,502)
Prior service credit expected to be recognized in next fiscal year	(566)
Actuarial loss expected to be recognized in next fiscal year	(43,882)
Accumulated benefit obligation	$ 1,448,277	1,558,908
Weighted average assumed annual rate of increase in the cost of medical benefits	7.00%
Weighted average assumed annual rate of increase in trending linearly cost	4.50%
Fair market value of plan assets	$ 1,146,430	1,188,673	1,112,314
Contributed domestic and foreign pension plans	47,830
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Company expects to contribute to its domestic and foreign pension plans	42,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Company expects to contribute to its domestic and foreign pension plans	52,000
German Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of plan assets	1,784	2,046
Pension Benefits - Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of plan assets	836,514	857,825	$ 823,790
U K Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of plan assets	$ 308,132	328,802
Reclassification of level 2 other investments to level 3		$ 12,775