Quarterly report pursuant to sections 13 or 15(d)

Changes in Carrying Value of Contingent Consideration Classified as Accounts Payable and Accrued Liabilities (Detail)

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Changes in Carrying Value of Contingent Consideration Classified as Accounts Payable and Accrued Liabilities (Detail) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Nov. 04, 2011
Business Acquisition, Contingent Consideration [Line Items]      
Fair value of contingent consideration, beginning of period   $ 7,111 $ 7,111
Change in fair value of contingent consideration (647) (6,202)  
Fair value of contingent consideration, end of period $ 909 $ 909 $ 7,111