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Net Income Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
Net Income Per Share - Additional Information (Detail)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Common stock equivalents excluded from the calculation of diluted earnings per share due to decline in market price of stock	7	28,123	201	32,967

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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