Cash, Cash Equivalents, and Available-For-Sale Investments - Cash and Investments in Marketable Securities, Including Cash Equivalents and Restricted Cash (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Jul. 11, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Cash Equivalents And Available For Sale Investments [Abstract]
Cash and cash equivalents	$ 39,067	$ 25,437		$ 15,312	$ 17,755
Short-term investments	197,959	251,757
Restricted Cash	25,000	25,000	25,000
Total cash and investments in marketable securities	$ 262,026	$ 302,194