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Goodwill and Intangible Assets (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Amortizable    
Gross Carrying Amount $ 460,694 $ 457,178
Accumulated Amortization 55,453 44,155
Non-Amortizable    
Gross Carrying Amount of trade names 29,620 29,580
Gross carrying amount of intangible assets 490,314 486,758
Customer relationships
   
Amortizable    
Gross Carrying Amount 408,975 407,835
Accumulated Amortization 39,387 30,959
Customer relationships | Minimum
   
Intangible assets    
Useful Lives 5 years 5 years
Customer relationships | Maximum
   
Intangible assets    
Useful Lives 20 years 20 years
Customer relationships | Weighted average
   
Intangible assets    
Useful Lives 11 years  
Lease and other agreements
   
Amortizable    
Gross Carrying Amount 15,210 15,210
Accumulated Amortization 7,642 7,018
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
Non-compete agreements
   
Amortizable    
Gross Carrying Amount 12,020 11,855
Accumulated Amortization 3,644 2,871
Non-compete agreements | Minimum
   
Intangible assets    
Useful Lives 2 years 2 years
Non-compete agreements | Maximum
   
Intangible assets    
Useful Lives 7 years 7 years
Trade names
   
Amortizable    
Gross Carrying Amount 2,784 2,784
Accumulated Amortization 401 326
Trade names | Minimum
   
Intangible assets    
Useful Lives 3 years 3 years
Trade names | Maximum
   
Intangible assets    
Useful Lives 10 years 10 years
Debt issuance costs
   
Amortizable    
Gross Carrying Amount 21,705 19,494
Accumulated Amortization $ 4,379 $ 2,981
Debt issuance costs | Minimum
   
Intangible assets    
Useful Lives 5 years 5 years
Debt issuance costs | Maximum
   
Intangible assets    
Useful Lives 10 years 10 years