Additional Future Cash Proceeds To Trigger Vesting

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Annualized Effective Compounded Return Rate

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Initial Public Offering Lock Up Period

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The number of common stock shares that were provided for the surrender of Employee Units.

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Number of tranches equity awards are divided into

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Performance Vesting Units Portion Of Grant

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Return On Investment

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that were modified during the period.

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No definition available.

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Change in the fair value of the modified award over the fair value of the award prior to the modification.

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Portion of employee units originally granted that were TVUs.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Percentage of vesting of share-based compensation awards.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Price of a single share of a number of saleable stocks of a company.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Equity-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012	Apr. 18, 2013	Apr. 19, 2013	Jan. 15, 2015	Apr. 24, 2013
Vested Time Vesting Units Surrendered for Shares of Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental Fair Value	$ 282,000
Unvested Time Vesting Units Surrendered for Unvested Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental Fair Value	220,000
Initial Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering price per share				27.00			$ 27.00
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld from employees to satisfy minimum tax withholding obligation	28,463	8,936
2.25x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	0	0	0
Unrecognized compensation cost		26,085,000
Annualized effective compounded return rate		20.00%
Return on investment		2.25%
Additional future funds receive		14,000,000
2.75x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	0	0	0
Unrecognized compensation cost		15,350,000
Annualized effective compounded return rate		15.00%
Return on investment		2.75%
Additional future funds receive		441,000,000
2.25x PVU Employee Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	0	0	0
2.75x PVU Employee Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	0	0	0
Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, holding period		1 year 6 months
Fair value assumptions, risk free rate		0.38%
Fair value assumptions, volatility		45.40%
Fair value assumptions, dividend yield		0.00%
Units Surrendered for Shares Plan [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares provided for surrender of units, in shares				4,165,861
Units Surrendered for Shares Plan [Member] \| Common Stock [Member] \| Class D Units and Vested TVUs Surrendered for Shares of Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares provided for surrender of units, in shares				949,142
Units Surrendered for Shares Plan [Member] \| Common Stock [Member] \| Unvested TVUs and PVUs Surrendered for Shares of Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares provided for surrender of units, in shares				3,216,719
Units Surrendered for Shares Plan [Member] \| TVUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, holding period		2 years
Fair value assumptions, risk free rate		0.24%
Fair value assumptions, volatility		37.60%
Fair value assumptions, dividend yield		0.00%
Pre-IPO Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Plan terms		Under the Employee Unit Incentive Plan ("Pre-IPO Incentive Plan"). The Employee Units which were granted were accounted for as equity awards and were divided into three tranches, Time-Vesting Units ("TVUs"), 2.25x Performance Vesting Units ("PVUs") and 2.75x PVUs. There was no related cost to the employee upon vesting of the units.
Weighted average grant date fair value			$ 23.15
Grant date fair value measuring method		The fair value of each Pre-IPO Incentive Plan Employee Unit originally granted prior to April 18, 2013 was estimated on the date of grant using a composite of the discounted cash flow model and the guideline public company approach to determine the underlying enterprise value.
Employee Unit fair value input discount rate		10.50%
Fair value assumptions, dividend yield		0.00%
Pre-IPO Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, holding period		2 years 7 months 6 days
Fair value assumptions, risk free rate		0.33%
Fair value assumptions, volatility		49.00%
Fair value assumptions, discount for lack of marketability		31.00%
Pre-IPO Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, holding period		3 years 7 months 6 days
Fair value assumptions, risk free rate		1.22%
Fair value assumptions, volatility		57.00%
Fair value assumptions, discount for lack of marketability		53.00%
Pre-IPO Incentive Plan [Member] \| TVUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of employee units originally granted that were TVUs		One-third
Vesting period		5 years
Vesting percentage per year		20.00%
Granted shares	0	0
Total fair value	1,050,000	1,020,000	850,000
Pre-IPO Incentive Plan [Member] \| Time Vesting Units and Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	1,938,000	955,000	1,191,000
Pre-IPO Incentive Plan [Member] \| Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		358,000
Granted shares	0	0
Weighted average grant date fair value		0
Total fair value	1,050,000	1,020,000	850,000
Grant date fair value	$ 4.19	4.72
Pre-IPO Incentive Plan [Member] \| Time Restricted Shares [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares		0
Vested shares		258,064
Pre-IPO Incentive Plan [Member] \| 2.25x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		0
Granted shares	0	0
Weighted average grant date fair value		0	$ 15.66
Impact of fair value modification reduced		1,650,000
Vested shares	0	0	0
Grant date fair value	$ 21.49	20.21
Pre-IPO Incentive Plan [Member] \| 2.25x Performance Restricted Shares [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares		0
Vested shares		0
Pre-IPO Incentive Plan [Member] \| 2.75x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		0
Granted shares	0	0
Weighted average grant date fair value		0	$ 10.52
Impact of fair value modification reduced		3,230,000
Vested shares	0	0	0
Grant date fair value	$ 14.40	11.89
Pre-IPO Incentive Plan [Member] \| 2.75x Performance Restricted Shares [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares		0
Vested shares		0
Pre-IPO Incentive Plan [Member] \| 2.25x PVU Employee Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Units vesting condition period		One-third
Pre-IPO Incentive Plan [Member] \| 2.75x PVU Employee Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Units vesting condition period		One-third
Pre-IPO Incentive Plan [Member] \| Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified shares		576,000
Employee Unit Plan and 2013 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches for each equity award		3
Grant date fair value measuring method		The grant date fair value of the Omnibus Plan 2.25x and 2.75x Performance Restricted shares was measured using the asset-or-nothing option pricing model
Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, holding period		2 years
Common stock reserved for future issuance					15,000,000
Restricted stock granted to directors, officers and employees					494,557
Initial public offering lock up period					180 days
Shares withheld from employees to satisfy minimum tax withholding obligation		8,936
Shares available for future issuance		14,511,216
Omnibus Incentive Plan [Member] \| Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Granted shares		33,273	0
Weighted average grant date fair value	$ 33.45	24.59
Total fair value	3,770,000	1,390,000
Vested shares		41,519	0
Grant date fair value	$ 33.35	27.40
Omnibus Incentive Plan [Member] \| Time Restricted Shares [Member] \| Subsequent Events [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, description						The earlier of the start date of a new Chief Executive Officer or on June 30, 2015
Omnibus Incentive Plan [Member] \| Time Restricted Shares [Member] \| Subsequent Events [Member] \| Interim Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares						100,000
Grant date fair value						16.50
Omnibus Incentive Plan [Member] \| Time Restricted Shares [Member] \| Subsequent Events [Member] \| New Board Member [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Granted shares						7,272
Grant date fair value						16.50
Omnibus Incentive Plan [Member] \| 2.25x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		0
Unrecognized compensation cost		4,339,000
Granted shares		0	0
Weighted average grant date fair value	$ 30.46	0
Impact of fair value modification reduced		560,000
Vested shares	0	0	0
Grant date fair value	$ 30.46	26.96
Omnibus Incentive Plan [Member] \| 2.75x Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		0
Unrecognized compensation cost		2,948,000
Granted shares		0	0
Weighted average grant date fair value	$ 23.05	0
Impact of fair value modification reduced		760,000
Vested shares	0	0	0
Grant date fair value	$ 23.05	18.32
Omnibus Incentive Plan [Member] \| Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified shares		77,000
Omnibus Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	4,088,000	1,394,000
Fair value assumptions, risk free rate		0.24%
Fair value assumptions, volatility		33.20%
Fair value assumptions, dividend yield		0.00%
Omnibus Grant [Member] \| Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		1,060,000