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Acquisitions (Detail)
 4 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2012
SM Canada [Member]
USD ($)
Dec. 31, 2012
SM Canada [Member]
USD ($)
Mar. 31, 2012
SM Canada [Member]
USD ($)
Mar. 31, 2012
SM Canada [Member]
CAD
Feb. 21, 2012
SM Canada [Member]
USD ($)
Feb. 21, 2012
SM Canada [Member]
CAD
Dec. 31, 2012
Cejon Acquisition [Member]
Dec. 31, 2011
Cejon Acquisition [Member]
USD ($)
May 25, 2011
Cejon Acquisition [Member]
USD ($)
Dec. 31, 2011
Topline Acquisition [Member]
USD ($)
May 20, 2011
Topline Acquisition [Member]
USD ($)
Adjustment to purchase price of acquisition         $ 2,681       $ 836   $ 0
Business Acquisition, Cost of Acquired Entity, Cash Paid           29,367,000     29,502,000   56,128,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       38,000,000         25,000,000    
Business Acquisition, Contingent Consideration, at Fair Value   19,975,000                  
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Years   15 years         15 years        
Business Combination, Acquisition Related Costs 951,000 800,000           531,000   529,000  
Financing Receivable, Gross     3,085,000 3,107,000              
Business Combination Contingent Consideration Arrangements Range Of Perfomance Indicators Value High                 11,000,000    
Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High Tier Two                 $ 33,000,000