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Acquisition and Transition Costs and Special Charges (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Acquisition and Transition Costs $ 58 $ 840 $ 3,465
Special Charges 170 662 3,894
Lexicon Partnership LLP [Member]
     
Business Acquisition [Line Items]      
Acquisition and Transition Costs     2,118
Special charges incurred In connection with exiting of lease commitment for office space     731
Special charges incurred for introducing fees     1,895
Special charges for other professional fees     $ 1,268