Accounting for Stock Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Director	Dec. 31, 2011 Employee Minimum	Dec. 31, 2011 Employee Maximum	Dec. 31, 2013 Equity Incentive Plan Two Thousand Thirteen	May 16, 2013 Equity Incentive Plan Two Thousand Thirteen	Dec. 31, 2013 Equity Incentive Plan Twenty Eleven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant							3,500,000	2,720,332	2,315,578
Stock options vesting period				1 year	3 years	5 years
Unrecognized compensation cost related to nonvested options and restricted options	$ 10,613	$ 3,902
Unrecognized share-based compensation cost recognition period	2 years
Share based compensation expense	3,103	823	1,403
Stock option grant expiration period	10 years
Weighted average grant date fair value of options granted	$ 4.71	$ 4.13	$ 4.78
Total intrinsic value of options exercised	$ 8,301	$ 1,663	$ 4,876