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Supplemental Disclosure of Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Cash Flow, Supplemental [Line Items]      
Non-cash interest on acquisition consideration payable $ 240 [1] $ 940 [1] $ 743 [1]
Cash paid for interest 548 602 388
Cash paid for income taxes $ 14,103 $ 18,475 $ 22,723
[1] recorded within interest expense