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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, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		876,000	1,288,000
Stock options granted under Black-Scholes options pricing model		122,000
Common stock, shares outstanding		108,251,981	106,384,982
Number of common shares, options exercisable		568,000
Common stock available for the granting of future options and restricted stock		647,192
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		17,500
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses on stock option		$ 485,000	$ 549,000	$ 876,000
Stock options granted under Black-Scholes options pricing model		121,500	83,000	169,000
Vesting period		5 years
Forfeiture rate		0.06%
Intrinsic value of options exercised		$ 3,900,000	$ 2,100,000	$ 2,500,000
Unrecognized compensation cost related to nonvested options granted		$ 978,000,000
Weighted-average period for expected cost recognized		3 years 2 months 12 days
Fair value of options vested		$ 489,000	524,000	841,000
Cash received from stock option exercises		$ 5,200,000	5,100,000	5,500,000
Common stock, shares outstanding		876,036
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		567,836
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options granted		$ 5,000,000
2008 Equity Incentive Plan, granted restricted stock awards		166,000
Weighted average fair value of restricted stock		$ 16.89
Period of compensation cost recognized		5 years
Amount of compensation cost recognized		$ 2,300,000	$ 2,200,000	$ 2,100,000
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		166,500	97,000	400,000
Weighted average fair value of restricted stock		$ 16.89	$ 16.07	$ 14.78
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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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