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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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 2,848	$ 4,669	$ 16,773	$ 19,317
Weighted average common shares outstanding used in basic EPS	43,377	43,287	43,315	43,327
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	655	849	677	924
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,032	44,136	43,992	44,251
Earnings per share
Basic	$ 0.07	$ 0.11	$ 0.39	$ 0.45
Diluted	$ 0.06	$ 0.11	$ 0.38	$ 0.44

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