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Stock Option Plans and Restricted Stock Awards - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2008	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		588,000	876,000
Stock options granted under Black-Scholes options pricing model		12,000
Cash received from stock option exercises		$ 2,683,000	$ 5,151,000	$ 5,144,000
Common stock, shares outstanding		110,184,922	108,251,981
Number of common shares, options exercisable		383,000
Common stock available for the granting of future options and restricted stock		583,192
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized issuance of shares of Company common stock	3,949,891
Expiry of equity incentive plan		2018
2008 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses on stock option		$ 399,000	$ 485,000	$ 549,000
Stock options granted under Black-Scholes options pricing model		11,500	121,500	83,000
Vesting period		5 years
Intrinsic value of options exercised		$ 3,800,000	$ 3,900,000	$ 2,100,000
Unrecognized compensation cost related to nonvested options granted		$ 736,000
Weighted-average period for expected cost recognized		2 years 7 months 6 days
Fair value of options vested		$ 505,000	489,000	524,000
Cash received from stock option exercises		$ 2,700,000	5,200,000	5,100,000
Common stock, shares outstanding		587,915
Options exercisable lower price range		$ 7.68
Options exercisable upper price range		$ 18.14
Stock Options [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares, options exercisable		383,315
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options granted		$ 4,600,000
2008 Equity Incentive Plan, granted restricted stock awards		73,000
Weighted average fair value of restricted stock		$ 21.59
Period of compensation cost recognized		5 years
Amount of compensation cost recognized		$ 2,600,000	$ 2,300,000	$ 2,200,000
Restricted Stock [Member] | 2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2008 Equity Incentive Plan, granted restricted stock awards		73,000	166,500	97,000
Weighted average fair value of restricted stock		$ 21.59	$ 16.89	$ 16.07
Restricted Stock [Member] | 2008 Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years	3 years	3 years
Restricted Stock [Member] | 2008 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years	5 years	5 years

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Common stock available for granting of future options and restricted stock.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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