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Stockholders' Equity - Additional Information (Detail) - USD ($) shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Apr. 30, 2007
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Total fair value of other stock awards vested | $ 1,647,000 |  | $ 2,654,000 |  |
Restricted Stock Awards [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Stock-based compensation expense | 729,000 | $ 594,000 | 1,278,000 | $ 1,080,000 |
Stock Options [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Stock-based compensation expense | 146,000 | 160,000 | 292,000 | 317,000 |
Unrecognized stock-based compensation expense | 929,000 |  | $ 929,000 |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 1 year 9 months 18 days |  |
Restricted Stock and Restricted Stock Unit [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 1 year 10 months 24 days |  |
Unrecognized stock-based compensation expense | 3,316,000 |  | $ 3,316,000 |  |
Performance-Based Stock Units [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 2 years 6 months |  |
Amended and Restated 1997 Employee Stock Purchase Plan [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Stock-based compensation expense | 26,000 | $ 21,000 | $ 52,000 | $ 38,000 |
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 | $ 442,000 |  | $ 442,000 |  |
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 | 562 |  | 562 |  |

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