Components of Income Before Income Tax Provision from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]
Domestic									$ 60,315	$ 32,498	$ 40,275
Foreign									41,096	(687)	(37,161)
Income (loss) before income tax provision	$ 10,623	$ 34,851	$ 27,472	$ 28,465	$ (1,280)	$ (47,261)	$ 46,801	$ 33,551	$ 101,411	$ 31,811	$ 3,114