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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2008	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan, options outstanding		532,000	588,000
Stock options granted under Black-Scholes options pricing model		141,000
Cash received from stock option exercises		$ 1,701,000	$ 2,683,000	$ 5,151,000
Common stock, shares outstanding		140,000,017	110,184,922
Number of common shares, options exercisable		275,000
Common stock available for the granting of future options and restricted stock		8,019,000
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized issuance of shares of Company common stock	9,000,000
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		622,620	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses on stock option		$ 400,281	$ 399,000	$ 485,000
Stock options granted under Black-Scholes options pricing model		140,500	11,500	121,500
Vesting period		5 years
Intrinsic value of options exercised		$ 2,200,000	$ 3,800,000	$ 3,900,000
Unrecognized compensation cost related to nonvested options granted		$ 957,000
Weighted-average period for expected cost recognized		2 years 10 months 24 days
Fair value of options vested		$ 364,000	505,000	489,000
Cash received from stock option exercises		$ 1,700,000	2,700,000	5,200,000
Common stock, shares outstanding		531,916
Options exercisable lower price range		$ 7.68
Options exercisable upper price range		$ 23.69
Stock Options [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares, options exercisable		275,416
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options granted		$ 8,800,000
2008 Equity Incentive Plan, granted restricted stock awards		424,000
Weighted average fair value of restricted stock		$ 23.84
Period of compensation cost recognized		5 years
Amount of compensation cost recognized		$ 3,100,000	$ 2,600,000	$ 2,300,000
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		424,000	73,000	166,500
Weighted average fair value of restricted stock		$ 23.84	$ 21.59	$ 16.89
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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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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