Potentially Dilutive Securities Not Included in Computation of Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
SARs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	939		4,212
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price	$ 9.10		$ 7.81
Restricted Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	3,739	[1]	1,302	[1]
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares			2
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price			$ 6.91
DSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	23		29

[1] Anti-dilutive securities include contingently issuable shares unvested as of March 31, 2014, the vesting of which is based on performance conditions and market conditions that have not yet been achieved. See Note 10, “Equity-Based Compensation.”