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				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	250		1,750		250		1,750
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price	$ 4.30		$ 6.91		$ 4.30		$ 6.91
SARs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	914,531		4,177,416		914,531		4,177,416
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price	$ 9.09		$ 7.81		$ 9.09		$ 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	3,811,935	[1]	1,237,354	[1]	3,811,935	[1]	1,237,354	[1]
DSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares	22,500		29,250		22,500		29,250

[1] Anti-dilutive securities include contingently issuable shares unvested as of June 30, 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.”