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Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | May 31, 2013 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Restricted Stock Award [Member] | Dec. 31, 2013 2009 Employee Stock Purchase Plan [Member] | Dec. 31, 2012 2009 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Performance Based Compensation [Member] | Dec. 31, 2013 Common Class A [Member] | Dec. 31, 2013 Common Class A [Member] 1996 Equity Incentive Plan [Member] | Dec. 31, 2013 Common Class A [Member] 2009 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance to directors and employees |  | 2,500,000 |  |  |  |  |  |  |  | 15,500,000 |
Expiration date of options granted under equity incentive plan |  |  |  |  | 10 years |  |  |  |  |  |
Award vesting period |  |  | 3 years | 5 years |  |  |  |  |  |  |
Award vesting terms | Vesting terms ranging from three to five years which primarily includes 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date. |  |  |  |  |  |  |  |  |  |
Accrued expenses, liability | $ 6,757 |  |  |  |  |  |  |  |  |  |
Period of graded vesting for option valuation | 4 years |  |  |  |  |  |  |  |  |  |
Period of cliff vesting for option valuation | 5 years |  |  |  |  |  |  |  |  |  |
Expected Volatility |  |  |  |  |  |  |  |  | 75.00% |  |
Volatility rate on publicly traded options |  |  |  |  |  |  |  |  | 25.00% |  |
Total unrecognized compensation cost related to nonvested awards | 24,107 |  |  |  |  |  |  |  |  |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 2 years |  |  |  |  |  |  |  |  |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 2,797,768 |  |  |  |  | 327,689 | 358,950 |  |  |  |
Aggregate intrinsic value of options outstanding | 62,609 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable | 47,085 |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | 15,362 |  |  |  |  |  |  |  |  |  |
New employee stock purchase plan, which reserved additional shares of common stock |  |  |  |  |  |  |  |  |  |  | 588,154
Employee stock purchase plan, which available for issuance of common stock |  |  |  |  |  |  |  |  |  |  | 88,154
Additional shares reserved under 2009 ESPP |  |  |  |  |  | 78,963 |  |  |  |  | 78,963
Range of awards of target number of share |  |  | 0.00% | 100.00% |  |  |  |  |  |  |
Compensation expense related to performance based compensation agreements |  |  |  |  |  |  |  | $ 7,231 |  |  |

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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 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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