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Intangible Assets, Net - Schedule of Activity in Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Intangible assets, net    
Intangible assets, net Balance, beginning of period $ 48,711 $ 52,096
Amortization (1,053) (955)
Intangible assets, net, ending balance $ 47,658 $ 51,141