Reconciliation of Segment Income from Operations to Income before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Total segment income from operations	$ 324,180	$ 325,509	$ 354,121
Interest and other debt expense	69,462	101,722	63,954
Income before income taxes	$ 254,718	$ 223,787	$ 290,167