Stock-Based Compensation - Stock Options - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Jul. 31, 2010	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range of exercise prices		$ 5.50
Upper range of exercise prices		$ 11.00
Intrinsic value based on share price		$ 8.73
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting provisions, description		The stock options contain exercise prices no less than the fair value of the Company's stock on the grant date and typically vest in installments over a period of four years.
Options vested in remaining period		4 years
Period of termination of employment		90 days
Stock options granted period	17 years	10 years
Options granted		7,500
Weighted average grant date fair value		$ 2.44
Period of expected life, options granted		5 years
Proceeds from options exercised		$ 200,000
Option exercised		27,270
Intrinsic value		34,000
Unrecognized compensation expense		$ 1,700,000
Weighted average period		1 year 4 months 24 days
Stock Options [Member] | Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted		24,736
Stock Options [Member] | Executive Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period		2 years
Stock Options [Member] | Executive Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period		4 years