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Reconciliation of Recurring Fair Value Measurements Recognized in Balance Sheet using Significant Unobservable (Level Three) Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 2,475 $ 2,454
Total realized and unrealized gains and losses    
Included in net income      
Included in other comprehensive loss (10) 11
Purchases, issuances and settlements      
Ending balance 2,465 2,465
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date