Share-Based Compensation - Certain Information Regarding Company's Share-Based Compensation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, Total	$ 6,417	$ 3,830	$ 2,848
Deferred tax benefits, Total	792	926	874
Realized tax benefits, Total	2,739	459	195
Excess tax benefits (shortfall)	359	(1,760)	195
Weighted average fair value per option or share, Restricted stock grants	$ 5.43
Intrinsic value of options exercised	6,131	437	507
Cash received for strike price and tax withholdings		652	204
Shares acquired through cashless exercise	1,966	147	70
Value of shares acquired through cashless exercise	12,630	583	263
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, Stock options	930	1,188	1,450
Deferred tax benefits, Total	359	458	559
Realized tax benefits, Total	2,365	168	195
Excess tax benefits (shortfall)	418	(1,618)	195
Weighted average fair value per option or share, Stock option grants	$ 0.79	$ 0.87	$ 1.67
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, Restricted Stock	5,487	2,642	1,398
Deferred tax benefits, Total	433	468	315
Realized tax benefits, Total	374	291
Excess tax benefits (shortfall)	(59)	(142)
Weighted average fair value per option or share, Restricted stock grants	$ 5.43	$ 3.37	$ 5.61
Fair value of restricted stock vested	$ 2,548	$ 1,164	$ 540

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.F)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Amount of deferred income tax expense (benefit) and income tax credits.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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-Publisher FASB

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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-Publisher FASB

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

+ References

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- Definition

Cash received for strike price and tax withholdings.

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- Definition

Shares acquired through cashless exercise.

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No definition available.

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- Definition

Value of shares acquired.

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