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Earnings Per Share - Additional Information (Detail)				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2014	May 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Restricted Stock Awards (RSAs) [Member]	Sep. 30, 2014 Restricted Stock Awards (RSAs) [Member]	Sep. 30, 2014 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Separation [Member]
Earnings Per Share [Line Items]
Common stock, shares outstanding	107,067,457	107,053,031	107,067,457					107,053,031
Spin-Off of shares								4
Antidilutive Securities excluded from Computation of Earnings Per Share				1,233,385	1,233,385	2,083,908	2,083,908

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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