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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Income Tax Contingency [Line Items]    
Effective tax rate includes favorable tax adjustment $ 6.6 $ 2.0
Increase in effective income tax rate Reconciliation 10.50%  
Cumulative effect of state and foreign valuation losses 1.40%  
Decrease in unrecognized tax positions 0.9  
Possible interest and accrued penalties 2.9  
State Exposures [Member]
   
Income Tax Contingency [Line Items]    
Effective tax rate includes favorable tax adjustment 9.2  
AIU London [Member]
   
Income Tax Contingency [Line Items]    
Effective tax rate includes favorable tax adjustment $ 2.6