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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended
Jul. 31, 2013
Entity
Jun. 30, 2012
Entity
Sep. 30, 2013
Oct. 30, 2013
Subsequent Event [Member]
Dec. 31, 2013
Subsequent Event [Member]
Entity
Subsequent Event [Line Items]          
Cash paid for acquisition   $ 57.5     $ 180.8
Number of shares issued for acquisition of company 763,272 1,927,113     2,747,412
Common stock value 18.7 37.3     69.3
Number of business acquisitions 2 4     3
Senior secured revolving credit facility     700.0 1,325.0  
Senior secured revolving credit       $ 1,625  
Maturity date of senior secured revolving credit facility     Aug. 02, 2016 Oct. 30, 2018