Stock-Based Compensation - 2006 Long-Term Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2010	Mar. 31, 2006
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized under plan	10,000	106,000	60,000
Stock options exercised		1,000	60,000
Options forfeited	18,000	16,000	53,000
Options outstanding	391,000	410,000	324,000	381,000
Stock-based compensation	$ 5,738	$ 8,621	$ 4,712
Total unrecognized compensation cost	$ 7,600	$ 7,500
Stock options granted	10,000	106,000	60,000
Exercise price	$ 6.20	$ 8.30	$ 13.50
2006 Long Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period for restricted stock	4 years
Contractual term of stock option granted	10 years
Vesting percentage for restricted shares issued to officers and employees	25.00%
Number of shares authorized under plan					5,000,000	3,000,000
Number of shares authorized under plan	981,125
Stock options exercised	755,503
Options forfeited	221,872
Options outstanding	3,750
Additional options issued	0
Weighted-average period	2 years
Stock options granted	981,125
Inducement Grant Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted, net of share repurchase from employees and share cancellations, shares	42,272
Inducement Grant Plan [Member] \| Certain Officers and Employees [Member] \| Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized under plan	10,299
Stock options granted	10,299
Exercise price	$ 6.20
Contractual term	7 years
Period of employment	3 years
Inducement Grant Plan [Member] \| Vest Over a Three Year Period of Continued Employment [Member] \| Certain Officers and Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period for restricted stock	3 years
Vesting percentage for restricted shares issued to officers and employees	33.00%
Issuance of common stock upon the vesting of Restricted Stock Units, net of share cancellations, shares	18,787
Inducement Grant Plan [Member] \| Vest Over a Three Year Period of Continued Employment [Member] \| Certain Officers and Employees [Member] \| Performance Share Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units granted	23,485
Inducement Grant Plan [Member] \| Vest Over a Three Year Period of Continued Employment [Member] \| Certain Officers and Employees [Member] \| Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage for restricted shares issued to officers and employees	33.00%

RigNet, Inc. 10-K