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Changes in Fair Value of Level 3 Forward Purchase Contract (Detail) (Forward Purchase Contracts, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Forward Purchase Contracts
   
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 744  
Issuance   1,080
Adjustments to fair value included in other income 12,347 12,011
Transfers to additional paid-in-capital (13,091) (13,091)
Ending Balance