Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Goodwill [Line Items]
Goodwill Balance, beginning	$ 2,163,785		$ 86,841
Goodwill impairment	(2,075,836)	(2,075,836)
Goodwill transferred to assets held for sale and divestitures	(1,108)
Goodwill Balance, ending	$ 86,841	$ 2,163,785	$ 86,841