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Capital Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 19, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Mar. 19, 2012 Reorganization Adjustments [Member]
Capital Stock Distribution [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  | 500,000,000 | 500,000,000
Preferred stock, shares authorized |  | 5,000,000 |  | 5,000,000 |
Preferred stock, par value |  | $ 0.00001 |  | $ 0.00001 |
Common stock, par value |  | $ 0.00001 |  | $ 0.00001 | $ 0.00001
Common stock, shares issued |  | 201,842,351 |  | 201,156,078 | 200,000,000
Amount of restricted share grants |  | $ 700 |  | $ 550 |
Unamortized value of unvested restricted share grant |  | 806 |  | 407 |
Stock-based compensation |  | $ 301 | $ 0 |  |
Award vesting period |  | 3 years |  |  |
Award vesting rights |  | 1/3 per year |  |  |
Number of shares vested | 385,364 | 385,364 |  |  |
Unvested shares |  | 1,456,987 |  | 1,156,078 |
Per share of unvested shares of common stock |  | $ 0.0001 |  |  |
Common stock, shares outstanding |  | 201,842,351 |  | 201,156,078 | 200,000,000
Preferred stock, shares issued |  | 0 |  | 0 |
Preferred stock, shares outstanding |  | 0 |  | 0 |

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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