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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 1,965	$ 2,848	$ 18,133	$ 16,773
Weighted average common shares outstanding used in basic EPS	43,558	43,377	43,539	43,315
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	504	655	424	677
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,062	44,032	43,963	43,992
Earnings per share
Basic	$ 0.05	$ 0.07	$ 0.42	$ 0.39
Diluted	$ 0.04	$ 0.06	$ 0.41	$ 0.38

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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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