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Commitments and Contingencies - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended
Feb. 04, 2014
Dec. 13, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Foreign Currency Forwards [Member]
Derivatives not Designated as Hedging Instruments [Member]
Derivative
Jun. 30, 2014
GMI Ratings [Member]
Jul. 31, 2013
December 2012 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Dec. 14, 2012
December 2012 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Dec. 13, 2012
December 2012 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Dec. 30, 2013
August 2013 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Jul. 31, 2013
August 2013 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Aug. 01, 2013
August 2013 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
May 05, 2014
February 2014 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Feb. 07, 2014
February 2014 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Feb. 07, 2014
February 2014 ASR Program [Member]
Accelerated Share Repurchase Program [Member]
Jun. 30, 2014
Prepaid and Other Assets [Member]
Jun. 30, 2014
Other Non-Current Assets [Member]
May 04, 2012
Term Loan A [Member]
Amended and Restated Credit Facility [Member]
Jun. 30, 2014
Senior Secured Revolving Facility [Member]
May 04, 2012
Senior Secured Revolving Facility [Member]
Amended and Restated Credit Facility [Member]
Mar. 31, 2013
2012 Term Loan [Member]
Jun. 30, 2014
2012 Term Loan [Member]
Minimum [Member]
Jun. 30, 2014
2012 Term Loan [Member]
Maximum [Member]
Dec. 12, 2013
Quarterly Periods from December 12, 2013 through December 31, 2015 [Member]
Dec. 12, 2013
Quarterly Periods from January 1, 2016 through September 30, 2018 [Member]
Dec. 12, 2013
Quarter Ending December 31, 2018 [Member]
Schedule Of Commitments And Contingencies [Line Items]                                                          
Annual rent expense     $ 6,800,000 $ 5,700,000 $ 13,400,000 $ 11,500,000                                              
Repurchase program authorizing the purchase of shares 300,000,000 300,000,000                                                      
Shares repurchases, value                       100,000,000     100,000,000     100,000,000                      
Repurchased common shares                   0.8 2.2   0.5 1.9   0.6 1.7                        
Repurchased common shares, average purchase price paid per share                   $ 33.47     $ 41.06     $ 43.10                          
Acquisition announcement date                 Jun. 27, 2014                                        
Total cash consideration                 15,000,000                                        
Expected completion date                 Sep. 30, 2014                                        
Aggregate amount of debt                                         880,000,000   100,000,000            
Prepayment of Term Loan                                               15,000,000          
Maturity period of the facility                                           Dec. 31, 2018              
Debt principal repayment                                                     5,100,000 10,100,000 658,100,000
Term loan description         The Company is required to repay $5.1 million in quarterly payments over the first two years and $10.1 million in quarterly payments over the following three years, with the exception of the final payment in December 2018, which will be $658.1 million (assuming no further prepayments).                                                
Initial bearing interest rate, percentage                                                 2.25% 2.40%      
Current maturities of long-term debt     19,778,000   19,778,000   19,772,000                                            
Discount on long-term debt current     500,000   500,000   500,000                                            
Long-term debt, net of current maturities     778,119,000   778,119,000   788,010,000                                            
Discount on long-term debt non current     1,500,000   1,500,000   1,700,000                                            
Deferred financing fees unamortized     7,400,000   7,400,000                           1,700,000 5,700,000                  
Amortized deferred financing fees     400,000 700,000 888,000 1,474,000                                              
Amortization of discount on long-term debt     100,000 200,000 240,000 474,000                                              
Fair market value of debt obligations     801,900,000   801,900,000   812,000,000                                            
Retained earnings restricted as to the payments of dividends     947,034,000   947,034,000   758,975,000                                            
Amount available for restricted payments         482,000,000                                                
Foreign currency forwards, notional amount               $ 13,000,000                                          
Number of foreign currency forward               1