Stock-Based Compensation (Detail) - Summary Of Changes In SARs Outstanding (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Weighted Average Remaining Contractual Term [Roll Forward]
Granted	2 years 7 months 35 days
Stock appreciation rights (SARs)
SARs [Roll Forward]
Outstanding at December 31, 2013 (in shares)	1,600,000
Granted (in shares)	400,000
Forfeited (in shares)	0
Exercised (in shares)	0
Outstanding at March 31, 2014 (in shares)	2,000,000	[1],[2]	1,600,000
Vested and exercisable at March 31, 2014 (in shares)	1,000,000	[1]
Per Share Weighted- Average Exercise Price [Roll Forward]
Outstanding at December 31, 2013 (in Dollars per share)	$ 34.14
Granted (in Dollars per share)	$ 64.64
Forfeited (in Dollars per share)	$ 0.00
Exercised (in Dollars per share)	$ 30.15
Outstanding at March 31, 2014 (in Dollars per share)	$ 40.28	[1],[2]	$ 34.14
Vested and exercisable at March 31, 2014 (in Dollars per share)	$ 29.27	[1]
Per Share Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2013 (in Dollars per share)	$ 11.63
Granted (in Dollars per share)	$ 14.99
Forfeited (in Dollars per share)	$ 0.00
Exercised (in Dollars per share)	$ 10.56
Outstanding at March 31, 2014 (in Dollars per share)	$ 12.31	[1],[2]	$ 11.63
Vested and exercisable at March 31, 2014 (in Dollars per share)	$ 10.39	[1]
Weighted Average Remaining Contractual Term [Roll Forward]
Outstanding at December 31, 2013	4 years 7 months 24 days	[1],[2]	4 years 4 months 2 days
Granted	6 years 10 months 15 days
Vested and exercisable at March 31, 2014	3 years 6 months 5 days	[1]

[1] Total SARs outstanding had an intrinsic value of $57.0 million. SARs vested and exercisable had an intrinsic value of $40.9 million.

[2] As of March 31, 2014, 1.0 million of the SARs outstanding were unvested. The Company expects that substantially all of these unvested awards will vest in future periods.