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Debt - Additional Information (Detail) (USD $) |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Aug. 06, 2013 Senior Secured Revolving Credit Facility [Member] | Dec. 31, 2013 Senior Secured Revolving Credit Facility [Member] | Sep. 30, 2013 Senior Secured Revolving Credit Facility [Member] | Mar. 07, 2013 Senior Secured Revolving Credit Facility [Member] | Dec. 31, 2013 Senior Secured Revolving Credit Facility [Member] Maximum [Member] | Jun. 06, 2013 Senior Secured Revolving Credit Facility [Member] Temporary Increase Credit Facility [Member] | Sep. 30, 2013 Senior Secured Revolving Credit Facility [Member] Extend Repayment Period [Member] | Dec. 31, 2013 Senior Secured Revolving Credit Facility [Member] Until March 2017 [Member] | Dec. 31, 2013 Senior Secured Revolving Credit Facility [Member] March 2017 and Thereafter [Member]
Proforma Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Credit facility amount, maximum | 500,000,000 |  |  |  | 800,000,000 |  |  | 1,000,000,000 |  |  |
Borrowings outstanding |  |  | 840,000,000 | 375,000,000 |  |  |  |  |  |  |
Proceeds from initial public offering |  |  | 716,000,000 |  |  |  |  |  |  |  |
Expiration of credit facility period |  |  |  | Mar. 07, 2015 |  |  |  |  | Sep. 30, 2018 |  |
Percentage of amount borrowed based on credit facility |  |  |  | 50.00% |  |  |  |  |  |  |
Debt instrument, description of variable rate |  |  |  | 30 day LIBOR plus |  |  |  |  |  | 30 day LIBOR | 30 day LIBOR
Debt instrument, basis spread on variable rate |  |  |  | 2.75% |  |  |  |  |  | 2.75% | 3.125%
Debt instrument interest rate description | All borrowings under the credit facility bear interest at 30 day LIBOR plus 2.75% until March 2017, and thereafter at 30 day LIBOR plus 3.125%. |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and borrowing capacity |  |  |  | 15,000,000 |  |  |  |  |  |  |
Cash and cash equivalents | $ 148,989,000 | $ 397,198,000 |  | $ 7,500,000 |  |  |  |  |  |  |
Tangible net worth, minimum percentage |  |  |  |  | 85.00% |  |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  |  | 1.0 |  |  |  |
Percentage of proceeds from additional equity capital |  |  |  | 85.00% |  |  |  |  |  |  |

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- Definition Cash And Cash Equivalent And Borrowing Capacity Available Under Credit Facilities Minimum Liquidity + References No definition available. + Details
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- Definition Debt Instrument Interest Rate Description + References No definition available. + Details
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- Definition Debt Instrument Leverage Ratio + References No definition available. + Details
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- Definition Minimum Tangible Net Worth Percentage + References No definition available. + Details
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- Definition Percentage Of Borrowing Base Of Line Of Credit Facility + References No definition available. + Details
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- Definition Percentage of Net Proceeds of Additional Equity Capital Raised + References No definition available. + Details
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- Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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