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Goodwill and Intangible Assets (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Amortizable -    
Gross Carrying Amount 489,449 145,924
Accumulated Amortization 29,807 8,174
Non-Amortizable -    
Gross carrying amount of trade names 27,564 11,740
Gross carrying amount of intangible assets 517,013 157,664
Lease and other agreements
   
Amortizable -    
Gross Carrying Amount 13,310 2,810
Accumulated Amortization 5,048 1,545
Lease and other agreements | Minimum
   
Intangible assets    
Useful Lives 1 year 1 year
Lease and other agreements | Maximum
   
Intangible assets    
Useful Lives 8 years 8 years
Customer relationships
   
Amortizable -    
Gross Carrying Amount 449,376 128,071
Accumulated Amortization 20,580 3,868
Customer relationships | Minimum
   
Intangible assets    
Useful Lives 5 years 5 years
Customer relationships | Maximum
   
Intangible assets    
Useful Lives 20 years 20 years
Non-compete agreements
   
Amortizable -    
Gross Carrying Amount 6,145 5,033
Accumulated Amortization 2,064 919
Non-compete agreements | Minimum
   
Intangible assets    
Useful Lives 2 years 2 years
Non-compete agreements | Maximum
   
Intangible assets    
Useful Lives 7 years 7 years
Debt issuance costs
   
Amortizable -    
Gross Carrying Amount 17,918 7,310
Accumulated Amortization 1,867 1,842
Debt issuance costs | Minimum
   
Intangible assets    
Useful Lives 5 years 5 years
Debt issuance costs | Maximum
   
Intangible assets    
Useful Lives 10 years 10 years
Trade names
   
Intangible assets    
Useful Lives 10 years  
Amortizable -    
Gross Carrying Amount 2,700 2,700
Accumulated Amortization 248