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Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting terms | vesting terms ranging from three to five years and include 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. |  |
Period of graded vesting for option valuation | 4 years |  |
Period of cliff vesting for option valuation | 5 years |  |
Total unrecognized compensation cost related to nonvested awards | $ 2,969 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year 2 months 1 day |  |
Aggregate shares of its Class A stock issued during the exchange | 68,000 |  |
New option exercise price per share | $ 33.04 |  |
Incremental cost of new option | 1,923 |  |
Vesting period of share | 5 years |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 2,240,929 |  |
The Aggregate intrinsic value of options outstanding | 35,380 |  |
The Aggregate intrinsic value of options exercisable | 23,827 |  |
Total intrinsic value of options exercised | 10,430 |  |
Compensation expense related to performance based compensation agreements | 14,466 | 11,650 | 17,839
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Range of awards of target number of share | 0.00% |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Range of awards of target number of share | 100.00% |  |
1996 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New option exercise price per share | $ 15.67 |  |
Restricted Stock Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration date of options granted under equity incentive plan | 10 years |  |
2009 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 358,950 | 253,294 |
New employee stock purchase plan, which reserved additional shares of common stock | 588,154 |  |
Performance Based Compensation [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense related to performance based compensation agreements | $ 7,970 |  |
Common Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected Volatility | 75.00% |  |
Volatility rate on publicly traded options | 25.00% |  |
Common Class A [Member] | 1996 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity Incentive Plan has reserved shares of Class A common stock | 13,000,000 |  |
Eligible Options to purchase an aggregate shares, accepted for cancellation | 2,630,474 |  |
Percentage of Class A common stock underlying all Eligible Options | 86.20% |  |
Aggregate shares of its Class A stock issued during the exchange | 1,030,819 |  |
Common Class A [Member] | 2009 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New employee stock purchase plan, which available for issuance of common stock | 88,154 |  |
Increase in the additional shares of Class A common stock | 77,928 |  |
Addition to the increased number of shares of Class A common stock | 250,000 |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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