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Stock-Based Compensation - Additional Information (Detail) (USD $)	6 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Feb. 29, 2012 Long-Term Incentive Plan 2012- 2014 [Member]	Feb. 28, 2013 Long-Term Incentive Plan 2013- 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options which vest			One third each year	One third each year
Performance stock units granted	330,639		589,934	330,639
Weighted average fair value units, granted	$ 12.97	$ 7.33

The weighted average fair value at grant date for nonvested equity-based awards issued 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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