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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 12, 2013
Alter [Member]
Jun. 30, 2013
Alter [Member]
Mar. 31, 2013
Alter [Member]
Aug. 29, 2012
Plasmart, Inc. [Member]
Business Acquisition [Line Items]              
Current assets       $ 1,053     $ 5,536
Property and equipment       211     3,565
Other assets       67     554
Intangible assets       2,806   2,806 10,745
Goodwill 150,909 150,733 140,084       9,989
Total assets acquired       4,137     30,389
Debt (Note 15)       770     4,561
Deferred taxes and other liabilities       920     3,128
Total liabilities assumed       1,690     7,689
Total purchase price       2,447     22,700
Cash acquired       (21)     (93)
Total purchase price, net of cash acquired $ 2,326 $ 22,607    $ 2,426 $ 2,058 $ 2,426 $ 22,607