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Acquisitions (Detail) (SM Canada [Member])
In Thousands, unless otherwise specified
4 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
CAD
Feb. 21, 2012
CAD
Business Acquisition, Cost of Acquired Entity, Cash Paid         29,367
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     37,327 38,000  
Business Acquisition, Contingent Consideration, at Fair Value   25,294      
Business Acquisition, Goodwill, Expected Tax Deductible Years   15 years      
Business Combination, Acquisition Related Costs 951 800      
Financing Receivable, Gross     $ 3,085 3,107