General form of registration statement for all companies including face-amount certificate companies

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]              
Allowance for doubtful accounts         $ 1.4 $ 1.9  
Advertising costs included in prepaid expenses and other assets         8.3 5.0  
Expenses related to advertising costs         83.7 79.9 87.4
Estimated residual values, percentage         15.00%    
Amounts of tax included on a gross basis $ 36.1 $ 34.1 $ 67.5 $ 66.6 $ 133.6 $ 129.4 $ 110.0
Revenue attributable to North American guests         82.00% 83.00% 83.00%
Anti-dilutive securities excluded from earnings per share, per share value 6,728,789   6,325,138