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Intangible Assets, Net - Schedule of Activity in Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Intangible assets, net    
Intangible assets, net Balance, beginning of period $ 48,711 $ 52,096
Purchases 356 350
Amortization (3,160) (2,893)
Intangible assets, net, ending balance $ 45,907 $ 49,553