Income Taxes - Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract]
U.S.									$ (38,114)	$ (17,849)	$ 51,618
Foreign									2,603	5,263	3,015
Income (loss) before income taxes	$ (9,106)	$ (9,814)	$ (10,173)	$ (6,418)	$ (2,085)	$ (844)	$ (3,386)	$ (6,271)	$ (35,511)	$ (12,586)	$ 54,633