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Proforma Effect in Net Revenue, Net Income and Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Clinical Trial Services | Dec. 31, 2012 Clinical Trial Services | Dec. 31, 2012 PriceSpective LLC | Dec. 31, 2011 PriceSpective LLC | Dec. 31, 2012 BeijingWits Medical Limited | Dec. 31, 2011 BeijingWits Medical Limited | Dec. 31, 2011 Firecrest Clinical Limited | Dec. 31, 2010 Firecrest Clinical Limited
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net revenue | $ 1,343,996 | $ 1,182,734 | $ 1,118,410 | $ 964,388 | $ 1,115,355 | $ 989,942 | $ 952,729 | $ 906,311
Net income | $ 103,133 | $ 58,944 | $ 55,931 | $ 25,363 | $ 55,349 | $ 22,549 | $ 25,851 | $ 86,127
Basic earnings per share | $ 1.69 | $ 0.98 | $ 0.93 | $ 0.42 | $ 0.92 | $ 0.37 | $ 0.43 | $ 1.44
Diluted earnings per share | $ 1.66 | $ 0.98 | $ 0.93 | $ 0.42 | $ 0.92 | $ 0.37 | $ 0.42 | $ 1.42

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