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Summary of Stock Incentive Plan Activity (Detail) (Stock Incentive Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Incentive Plan [Member]
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding beginning balance	$ 22.91	$ 23.06	$ 12.62
Weighted-Average Grant Date Fair Value, Granted	$ 31.95	$ 22.59	$ 23.94
Weighted-Average Grant Date Fair Value, Awarded	$ 30.71		$ 11.41
Weighted-Average Grant Date Fair Value, Vested
Weighted-Average Grant Date Fair Value, Forfeited	$ 23.88	$ 23.62	$ 23.94
Weighted-Average Grant Date Fair Value, Outstanding ending balance	$ 27.96	$ 22.91	$ 23.06
Granted Shares
Granted Shares, Outstanding beginning balance	3,157,311	2,478,057	192,245
Granted Shares, Granted	3,719,974	814,545	2,375,892
Granted Shares, Awarded
Granted Shares, Vested
Granted Shares, Forfeited	(271,184)	(135,291)	(90,080)
Granted Shares, Outstanding ending balance	6,606,101	3,157,311	2,478,057
Awarded Shares
Awarded Shares, Outstanding beginning balance	37,408	37,408	38,449
Awarded Shares, Granted
Awarded Shares, Awarded	966,215		(1,041)
Awarded Shares, Vested
Awarded Shares, Forfeited	(7,906)
Awarded Shares, Outstanding ending balance	995,717	37,408	37,408
Shares Not Yet Awarded
Shares Not Yet Awarded, Outstanding beginning balance	3,119,903	2,440,649	153,796
Shares Not Yet Awarded, Granted	3,719,974	814,545	2,375,892
Shares Not Yet Awarded, Awarded	(966,215)		1,041
Shares Not Yet Awarded, Forfeited	(263,278)	(135,291)	(90,080)
Shares Not Yet Awarded, Outstanding ending balance	5,610,384	3,119,903	2,440,649

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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