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Debt - Additional Information (Detail) (USD $)			1 Months Ended	12 Months Ended			12 Months Ended		0 Months Ended	12 Months Ended
	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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Cash And Cash Equivalent And Borrowing Capacity Available Under Credit Facilities Minimum Liquidity

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Debt Instrument Interest Rate Description

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Debt Instrument Leverage Ratio

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Minimum Tangible Net Worth Percentage

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Percentage Of Borrowing Base Of Line Of Credit Facility

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Percentage of Net Proceeds of Additional Equity Capital Raised

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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.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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Amount borrowed under the credit facility as of the balance sheet date.

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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.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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