Stock Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	May 16, 2011	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	May 16, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum						1,500,000
Aggregate number of shares issued in respect of restricted stock awards	350,000
Options available for award each plan year						1,150,000
Maximum number of shares of restricted stock or shares subject to a restricted stock units award granted				50,000
Maximum number of options and stock appreciation rights				100,000
Percentage of restricted stock and restricted stock units vest				25.00%
Vesting period of awards				1/3 per year over the first three anniversaries of the award
Recognition of compensation expense		$ 670	$ 471	$ 1,160	$ 855
Number of share avaliable for grant for prior plans		0		0
Maximum term for awards granted (years)				10 years
Shares issued related stock option exercises				334,662	30,350
Total intrinsic value of options exercised				$ 3,757	$ 118
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted				66,949
Vesting period				4 years
Non-qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted				204,800