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Reconciliation of Net Income Per Share - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Anti-dilutive options	98	1,148	1,187
Anti-dilutive securities excluded from computation of earnings per share minimum price range	$ 19.63	$ 8.54	$ 8.54
Anti-dilutive securities excluded from computation of earnings per share maximum price range one	$ 22.69	$ 14.13	$ 14.13

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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