Common Stock and Earnings Per Share - Details of Earnings Per Share Calculations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income from continuing operations	$ 6,893	$ 1,850	$ 10,419	$ 4,262
Income (loss) from discontinued operations	(7)	(41)	(22)	333
Net income	$ 6,886	$ 1,809	$ 10,397	$ 4,595
Weighted average common shares outstanding:
Basic	39,358	38,908	39,315	38,798
Diluted	39,471	39,226	39,430	39,145
Basic income (loss) per share
Continuing	$ 0.18	$ 0.05	$ 0.26	$ 0.11
Discontinued	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total	$ 0.18	$ 0.05	$ 0.26	$ 0.12
Diluted income (loss) per share
Continuing	$ 0.17	$ 0.05	$ 0.26	$ 0.11
Discontinued	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total	$ 0.17	$ 0.05	$ 0.26	$ 0.12

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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