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Debt - Additional Information 4 (Detail)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jun. 30, 2012
Jun. 30, 2013
Term loan tranche [Member]
USD ($)
Jun. 30, 2013
Propel TLC Facility [Member]
USD ($)
Jun. 30, 2013
Propel TLC Facility [Member]
USD ($)
Jun. 30, 2013
2012 Convertible Senior Notes [Member]
USD ($)
Jun. 24, 2013
2013 Convertible Senior Notes [Member]
USD ($)
Jun. 30, 2013
2013 Convertible Senior Notes [Member]
USD ($)
Aug. 02, 2013
Subsequent Event [Member]
EUR (€)
May 09, 2013
Subsequent Event [Member]
USD ($)
May 09, 2013
Subsequent Event [Member]
Previously reported [Member]
USD ($)
May 09, 2013
Subsequent Event [Member]
Revolving credit facility [Member]
USD ($)
May 09, 2013
Subsequent Event [Member]
Term loan tranche [Member]
USD ($)
Jul. 18, 2013
Subsequent Event [Member]
2013 Convertible Senior Notes [Member]
USD ($)
Dec. 31, 2012
2012 Convertible Senior Notes [Member]
USD ($)
Nov. 27, 2012
2012 Convertible Senior Notes [Member]
USD ($)
Jun. 30, 2013
2012 Convertible Senior Notes [Member]
USD ($)
Jun. 24, 2013
2013 Convertible Senior Notes [Member]
USD ($)
Jun. 30, 2013
2013 Convertible Senior Notes [Member]
USD ($)
Jul. 18, 2013
2013 Convertible Senior Notes [Member]
Subsequent Event [Member]
USD ($)
Jun. 30, 2013
Computer hardware and software [Member]
USD ($)
Jun. 30, 2013
Option one [Member]
Minimum [Member]
Term loan tranche [Member]
Jun. 30, 2013
Option one [Member]
Maximum [Member]
Term loan tranche [Member]
Jun. 30, 2013
Option Two [Member]
Minimum [Member]
Term loan tranche [Member]
Jun. 30, 2013
Option Two [Member]
Maximum [Member]
Term loan tranche [Member]
Debt Instrument [Line Items]                                                      
Proceeds from issuance of additional convertible senior notes $ 150,000,000               $ 150,000,000             $ 22,500,000 $ 15,000,000 $ 100,000,000   $ 150,000,000   $ 22,500,000          
Senior secured notes, stated percentage                 3.00%                 3.00%   3.00%              
Maturity date of 3.0% convertible senior notes                 Jul. 01, 2020                 Nov. 27, 2017   Jul. 01, 2020              
Convertible senior notes outstanding 265,000,000   115,000,000               100,000,000         172,500,000   115,000,000       172,500,000          
Debt instrument interest payment date                                     Interest on the 2012 Convertible Notes is payable semi-annually, in arrears, on May 27 and November 27 of each year   Interest on the 2013 Convertible Notes is payable semi-annually, in arrears, on January 1and July 1 of each year            
Initial conversion rate                                   31.6832   21.8718              
Convertible senior notes, principal amount                                   1,000   1,000              
Initial conversion price                                   $ 31.56   $ 45.72              
Total commitment on revolving credit facility tranche   445,000,000                   662,500,000 425,000,000                            
Increase in borrowing capacity         48,600,000                 168,900,000 48,600,000                        
Aggregate revolving loan commitment                           613,900,000                          
Term loan facility                             198,600,000                        
Debt instrument term           4 years 4 years               6 months                        
Accordion feature would allow to increase the facility, amount                           162,500,000                          
Basis spread on variable rate           3.25% 3.00%                                 2.50% 3.00% 1.50% 2.00%
Default basis spread on variable rate           4.00%                                          
Acquisition outstanding amount 446,000,000   258,000,000     36,699,000 36,699,000                                        
Wighted average interest rate 3.17%     4.11%   5.17% 5.17%                                        
Average price of common stock               $ 31.56   $ 45.72                                  
Strike price of the Warrant Transactions                                     $ 44.1875                
Effective conversion price of Notes                                     $ 44.1875                
Proceeds from sale of Notes                                     111,100,000   144,900,000            
Net proceeds used for payment of convertible note hedge transaction cost                                     11,500,000   15,800,000            
Net proceeds to repurchase shares of the Company's common stock                                     25,000,000                
Net proceeds to repay borrowings under Company's revolving credit facility                                     61,500,000                
Fair value of notes                                     100,300,000   122,000,000            
Residual value 42,748,000   14,702,000                               14,700,000   28,000,000            
Debt issuance cost                                     3,300,000   4,300,000            
Initial debt issuance costs                                     3,800,000   5,300,000            
Equity issuance cost                                     500,000   1,000,000            
Capped Call Transactions cost                                         15,800,000            
Cap price of capped call transactions                                         $ 61.5475            
Effective interest rate on the liability component                                     6.00%   6.35%            
Capital lease obligations $ 8,026,000   $ 9,252,000                                       $ 8,000,000        
Capital lease obligations, minimum percentage 0.00%                                                    
Capital lease obligations, maximum percentage 7.70%