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Stock Incentive Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 Installment | Jul. 31, 2012 Installment | Dec. 31, 2013 Installment | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |
Options issued to outside consultants or advisors |  |  | 0 |  |  |
Number of shares of common stock reserved for issuance under the 2009 Plan |  |  | 1,000,000 |  |  |
Aggregate number of shares for which incentive stock options may be granted under the Plan |  |  | 900,000 |  |  |
Option awards shares outstanding under the 2009 plan together with the 2003 Plan and its predecessor |  |  | 400,399 | 538,697 | 671,294 | 399,569
Outstanding options expiration period from the date of grant |  |  | 10 years |  |  |
Number of equal annual installments options are exercisable |  |  | 4 |  |  |
Options exercisable period after date of grant |  |  | 1 year |  |  |
New grants of stock options | 44,970 | 47,500 | 0 |  |  |
Options granted |  |  | 0 | 0 | 0 |
Fair value of restricted stock units, granted | $ 50.28 | $ 21.44 |  |  |  |
Number of equal annual installments in which restricted stock units vest | 4 | 4 |  |  |  |
Annual installments for vesting of restricted stock beginning from date of grant, period | 1 year | 1 year |  |  |  |
Unrecognized compensation expense related to stock options |  |  | $ 3.8 |  |  |
Weighted average period |  |  | 3 years 7 months 10 days |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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