Stock Based Awards and Other Equity Instruments - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Stock Options [Member]	Jun. 28, 2013 Stock Options [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period of outstanding equity award					4 years		4 years
Stock-based compensation	$ 10,208,000	$ 6,768,000	$ 23,819,000	$ 11,460,000
Total income tax benefit related to stock-based compensation expense	$ 4,000,000	$ 2,500,000	$ 9,300,000	$ 4,000,000
Number of Additional Shares Authorized			15,000,000
Term of stock options, granted					10 years
Vesting period of stock options					4 years
Number of stock options granted			1,562,000		1,561,789
Grant-date fair value per option					$ 23.15
Stock options vest period					4 years		4 years
Closing stock price						$ 60.87
Expected dividend yield	0.00%	0.00%	0.00%	0.00%	0.00%
RSUs granted under Incentive Plan							994,293