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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		1,288,000	1,688,000
Stock options granted under Black-Scholes options pricing model		83,000
Common stock, shares outstanding		106,384,982	105,893,216
Number of common shares, options exercisable		984,000
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		166,710
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses on stock option		$ 549,000	$ 876,000	$ 850,000
Stock options granted under Black-Scholes options pricing model		83,000	169,000	45,000
Vesting period		5 years
Forfeiture rate		6.00%
Intrinsic value of options exercised		$ 2,100,000	$ 2,500,000	$ 1,400,000
Unrecognized compensation cost related to nonvested options granted		$ 1,100,000
Weighted-average period for expected cost recognized		3 years 1 month 6 days
Fair value of options vested		$ 524,000	841,000	918,000
Cash received from stock option exercises		$ 5,100,000	5,500,000	4,500,000
Common stock, shares outstanding		1,288,438
Options exercisable lower price range		$ 7.68
Options exercisable upper price range		$ 16.97
Stock Options [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares, options exercisable		984,238
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options granted		$ 5,500,000
Weighted average fair value of restricted stock		$ 16.07
Period of compensation cost recognized		5 years
Amount of compensation cost recognized		$ 2,200,000	$ 2,100,000	$ 1,100,000
Common stock available for the granting of future options and restricted stock		843,392
Restricted Stock [Member] | 2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years	5 years	5 years
2008 Equity Incentive Plan, granted restricted stock awards		97,000	400,000	100,000
Weighted average fair value of restricted stock		$ 16.07	$ 14.78	$ 13.25

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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