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	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income-continuing operations	$ 11,209	$ 3,369	$ 21,628	$ 7,631
Net income (loss)-discontinued operations	(46)	(47)	(68)	286
Net income	$ 11,163	$ 3,322	$ 21,560	$ 7,917
Weighted average common shares outstanding
Basic	39,358	38,910	39,330	38,836
Incremental shares with dilutive effect:
Diluted	39,541	39,226	39,467	39,172
Basic income (loss) per share
Continuing operations	$ 0.28	$ 0.09	$ 0.55	$ 0.19
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total net income per share	$ 0.28	$ 0.09	$ 0.55	$ 0.20
Diluted income (loss) per share
Continuing operations	$ 0.28	$ 0.08	$ 0.55	$ 0.19
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total net income per share	$ 0.28	$ 0.08	$ 0.55	$ 0.20
Employee Stock Option [Member]
Incremental shares with dilutive effect:
Stock options		198		198
Restricted Stock [Member]
Incremental shares with dilutive effect:
Stock options	183	118	137	138

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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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