Computed Amount and Differences in Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Pretax income	$ 353,129	$ 86,204	$ 273,881
Computed amount at statutory rate of 35%	123,595	30,171	95,858
State and local income tax (net of federal tax benefit)	4,382	2,406	1,515
Taxes on non-U.S. earnings-net of foreign tax credits	(9,683)	1,189	(4,522)
Effect of flow-through entities	(7,267)	(7,846)	(6,922)
Asset impairments	0	28,524	0
U.S. business tax credits	(1,516)	0	(917)
Domestic activities production deduction	(6,217)	(5,267)	(4,589)
Other	(5,380)	(603)	(399)
Total provision for income taxes	$ 97,914	$ 48,574	$ 80,024