Net Income Per Share - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Parenthetical) (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities were not included in the computation of net income per diluted share	1,013	3,267	1,025	3,286
Restricted Stock [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities were not included in the computation of net income per diluted share	0		6
Restricted Stock Unit [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities were not included in the computation of net income per diluted share		7		7