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Operating Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues $ 258,352 $ 228,964 $ 256,278 $ 248,873 $ 234,085 $ 203,152 $ 213,254 $ 218,826 $ 992,467 $ 869,317 $ 733,045
Long-lived assets 527,979       271,494       527,979 271,494  
U.S. [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 854,766 800,564 700,354
Long-lived assets 317,887       240,661       317,887 240,661  
Mexico [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 110,927 58,257 30,609
Long-lived assets 155,488       22,945       155,488 22,945  
Canada [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 16,582 10,496 2,082
Long-lived assets 10,199       7,888       10,199 7,888  
U.K. [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 10,192 0 0
Long-lived assets 44,363       0       44,363 0  
Other [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets $ 42       $ 0       $ 42 $ 0