Accrued and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Accounts Payable And Accrued Liabilities [Line Items]
Employee-related	$ 9,731		$ 12,293
Other	15,143		7,666
Accrued and other current liabilities	$ 24,874	[1]	$ 19,959	[2]

[1] Restated and Revised, see Notes 2 and 7

[2] Revised, see Note 2