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Stock Option Plan and Stock Grants - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | May 31, 2014 Management [Member] | May 31, 2014 Director [Member] | May 13, 2014 Director [Member] | May 31, 2014 Restricted Stock [Member] Management [Member] | May 31, 2014 Restricted Stock [Member] Director [Member] | May 13, 2014 Restricted Stock [Member] Director [Member] | May 31, 2014 Restricted Stock [Member] Director [Member] Phase One [Member] | May 13, 2014 Restricted Stock [Member] Director [Member] Phase One [Member] | May 31, 2014 Restricted Stock [Member] Director [Member] Phase Two [Member] | May 13, 2014 Restricted Stock [Member] Director [Member] Phase Two [Member] | May 31, 2014 Restricted Stock [Member] Director [Member] Phase Three [Member] | May 13, 2014 Restricted Stock [Member] Director [Member] Phase Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of stock-related compensation | $ 2,600,000 | $ 1,600,000 | $ 4,998,000 | $ 4,332,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  | 84,666 | 62,000 | 40,000 |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance | 3,750,000 |  | 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued |  |  |  |  |  |  |  | $ 3,600,000 | $ 2,600,000 | $ 1,700,000 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vesting Date |  |  |  |  |  |  |  | Dec. 31, 2014 |  |  | Dec. 31, 2014 | Nov. 13, 2014 | Dec. 31, 2015 | May 13, 2015 | Dec. 31, 2016 | May 13, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  | These Restricted Stock Grants will vest on December 31, 2014. | One-third of the shares of restricted common stock covered by these awards vests on each of December 31, 2014, December 31, 2015, and December 31, 2016. | One-third of the shares of restricted common stock covered by these awards vests on each of November 13, 2014, May 13, 2015, and May 13, 2016. |  |  |  |  |  |  |  |  |

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- Definition Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date. + 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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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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