Other Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Accounts Payable And Accrued Liabilities [Line Items]
Employee-related	$ 6,712		$ 188
Penalty payment derivative	138		138
Other	1,297		1,536
Other noncurrent liabilities	$ 8,147	[1]	$ 1,862	[2]

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

[2] Revised, see Note 2