Partners' Capital, Equity and Incentive Compensation Plans - Summary of Assumptions and Fair Values for Class O Units, Class RS Units, Restricted Stock and Options to Purchase Shares of Class A Common Stock Granted (Detail) (USD $)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of Restricted stock granted

$ 21.00

Expected term (years)

4 years

Expected volatility

55.00%

60.00%

Expected Dividend yield

5.50%

0.00%

Expected Risk-free interest rates

0.17%

0.61%

Class RS Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of Units granted

$ 7.15

$ 6.95

Class O Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of Units granted

$ 2.94

Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of options granted

$ 3.45

Expected term (years)

5 years 6 months

Expected volatility

32.00%

Expected Risk-free interest rates

1.40%

Minimum [Member] | Class O Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of Units granted

$ 10.26

$ 1.79

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of options granted

$ 3.52

Expected term (years)

7 years

Expected volatility

40.00%

Expected Risk-free interest rates

1.80%

Maximum [Member] | Class O Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value of Units granted

$ 10.92

$ 2.32