Other Noncurrent Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Other Liabilities [Line Items]
Benefit plan liabilities	$ 203,251	$ 229,963	$ 183,933
Noncurrent tax liabilities	168,704	171,181	166,244
Other	163,314	182,882	165,256
Total other noncurrent liabilities	$ 535,269	$ 584,026	$ 515,433