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Stockholders' Equity - Additional Information (Detail) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Apr. 30, 2007
Limited Partners' Capital Account [Line Items]
Total fair value of other stock awards vested	$ 1,006,000
Restricted Stock Awards [Member]
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	550,000	$ 486,000
Stock Options [Member]
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	146,000	$ 157,000
Unrecognized stock-based compensation expense	$ 1,078,000
Unrecognized stock-based compensation expense, weighted average period	2 years 1 month 6 days
Restricted Stock and Restricted Stock Unit [Member]
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	$ 3,839,000
Unrecognized stock-based compensation expense, weighted average period		1 year 10 months 24 days
Performance-Based Stock Units [Member]
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period		2 years 9 months 18 days
Amended and Restated 1997 Employee Stock Purchase Plan [Member]
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 26,000	$ 17,000
Non-Employee Director [Member] | Restricted Stock Awards [Member]
Limited Partners' Capital Account [Line Items]
Options vesting period	3 years
Minimum [Member] | 2006 Stock Incentive Plan [Member]
Limited Partners' Capital Account [Line Items]
Options vesting period	1 year
Maximum [Member] | Performance-Based Stock Units [Member]
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	$ 451,000
Maximum [Member] | 2006 Stock Incentive Plan [Member]
Limited Partners' Capital Account [Line Items]
Options vesting period	4 years
Options granted period	10 years
Class A Common Stock [Member] | 2006 Stock Incentive Plan [Member]
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares			2,475
Number of shares available for future grant	546

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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