Stock-Based Compensation - Summary of Retention Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	6 Months Ended
	Apr. 30, 2013	Jun. 30, 2013
Schedule Of Stock Options [Line Items]
Options outstanding, beginning balance, shares		1,099,106
Retention Stock Options Granted, shares		689,550
Options outstanding, ending balance, shares		1,665,614
Retention Stock Options outstanding, Exercisable, Ending balance, shares		941,331
Options outstanding, beginning balance, Weighted Average Exercise Price		$ 9.06
Retention Stock Options Granted, Weighted Average Exercise Price		$ 7.20
Options outstanding, ending balance, Weighted Average Exercise Price		$ 8.40
Retention Stock Options outstanding, Exercisable, Ending balance, Weighted Average Exercise Price		$ 9.35
Executive Officer [Member] | Retention Stock Options [Member]
Schedule Of Stock Options [Line Items]
Options outstanding, beginning balance, shares
Retention Stock Options Granted, shares	182,500	182,500
Options outstanding, ending balance, shares		182,500
Retention Stock Options outstanding, Exercisable, Ending balance, shares
Options outstanding, beginning balance, Weighted Average Exercise Price		$ 0.00
Retention Stock Options Granted, Weighted Average Exercise Price		$ 7.16
Options outstanding, ending balance, Weighted Average Exercise Price		$ 7.16
Retention Stock Options outstanding, Exercisable, Ending balance, Weighted Average Exercise Price