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Summary of Significant Accounting Policies - Reconciliation of the Numerator and Denominator Used in the Calculation of Basic and Diluted Net (Loss) Income Per Share (Parenthetical) (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Outstanding stock options and unvested restricted stock awards excluded from computation of diluted EPS	5.3	4.2	2.7
Stock Options and Unvested Restricted Stock Awards [Member]
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Outstanding stock options and unvested restricted stock awards excluded from computation of diluted EPS	0.5

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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