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Business Combinations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 1 Months Ended
Oct. 31, 2011
Moose Mountain
Dec. 31, 2012
Moose Mountain
Jul. 26, 2012
Maui, Inc.
Sep. 14, 2012
JKID, LTD.
Installment
Business Acquisition [Line Items]        
Business acquisition, total initial consideration $ 32.2   $ 37.6  
Business acquisition, cash paid 16.7   36.2 1.1
Business acquisition, liabilities assumed 15.5   1.4  
Goodwill acquired in business combination 14.2      
Business acquisition maximum additional earn-out payment 5.3   18.0 4.4
Additional earn-out payment period 3 years   3 years 2 years
Fair value of the expected earn-out included in goodwill   4.6 16.0  
Business acquisition, deferred cash payment       5.5
Business acquisition, deferred cash payment in installment       $ 1.1
Number of semi-annual payment of deferred cash payment       5