Supplemental Financial Information - Noncash Investing and Financing Activities (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Interest payments, net of amounts capitalized	$ 16,500,000	$ 46,200,000	$ 71,900,000
Interest paid	82,938,000	83,125,000	82,938,000
Internal Revenue Service [Member]
Condensed Financial Statements, Captions [Line Items]
Interest paid		$ 200,000