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Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Based Compensation [Line Items]
Stock Option
Exercise of stock options, Shares	(277)
Issuance of stock	163
Compensation expense	2,472	2,804	3,140
Deferred compensation	0	2,424
Restricted Stock [Member]
Stock Based Compensation [Line Items]
Compensation expense	1,871	1,849	1,415
Unamortized future compensation expense	1,691
Performance Shares [Member]
Stock Based Compensation [Line Items]
Compensation expense	600	956	1,725
Unamortized future compensation expense	592
Number of shares to be earned from awards granted	0	0	276
Other Long Term Stock Incentive Awards [Member]
Stock Based Compensation [Line Items]
Unamortized future compensation expense	0
Long-term stock incentive awards granted	0
Minimum [Member]
Stock Based Compensation [Line Items]
Restricted stock vesting period	3 years
Performance stock vesting period	3 years
Minimum [Member] | Stock Options [Member]
Stock Based Compensation [Line Items]
Options granted terms	6 years
Vesting period	1 year
Maximum [Member]
Stock Based Compensation [Line Items]
Restricted stock vesting period	4 years
Performance stock vesting period	4 years
Maximum [Member] | Stock Options [Member]
Stock Based Compensation [Line Items]
Options granted terms	10 years
Vesting period	5 years
Two Thousand and Nine Equity Incentive Plan [Member]
Stock Based Compensation [Line Items]
Number of shares allowed to be issued	6,618
Percentage of Shares issued and outstanding	16.70%
2012 Awards [Member] | Other Long Term Stock Incentive Awards [Member]
Stock Based Compensation [Line Items]
Deferred compensation		0
Performance period		1 year
2010 Awards [Member] | Other Long Term Stock Incentive Awards [Member]
Stock Based Compensation [Line Items]
Vesting period		3 years
Deferred compensation		$ 2,424

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

The number of grants made 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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- Definition

Number of share options (or share units) exercised during the current period.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Period For Achieving Performance Target

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options earned in period.

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No definition available.

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- Definition

Share based compensation arrangement by Share based payment award percentage of shares issued and outstanding as of the balance sheet date.

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Share based compensation arrangement by share based payment award performance stock award vesting period.

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Share based compensation arrangement by share based payment award restricted stock award vesting period.

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Share based compensation arrangement by share based payment stock option vesting period which is contingent upon service.

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Share based compensation awards number of shares allowed to be issued.

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- Definition

Stock issued during period shares stock options exercised net.

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