Share-Based Compensation - Summary of the Activity in the Stock Option Plan (Detail) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Stock Based Compensation [Abstract]
Outstanding, Shares, Beginning Balance | shares	92
Exercised, Shares | shares	(29)
Forfeited/expired, Shares | shares	(6)
Outstanding, Shares, Ending Balance | shares	57
Options exercisable at end of year, Shares | shares	57
Weighted Average Exercise Price, Beginning of Period | $ / shares	$ 6.30
Exercised, Weighted Average Exercise Price | $ / shares	10.44
Forfeited/expired, Weighted Average Exercise Price | $ / shares	7.73
Weighted Average Exercise Price, End of Period | $ / shares	4.11
Options exercisable at end of year, Weighted Average Exercise Price | $ / shares	$ 4.11
Weighted Average Remaining Contractual Term in Years, End of Period	2 years 7 days
Options exercisable at end of year, Weighted Average Remaining Contractual Terms in Years	2 years 7 days
Aggregate Intrinsic Value, End of Period | $	$ 814,200
Options exercisable at end of year, Aggregate Intrinsic Value | $	$ 814,200