Share-Based and Other Deferred Compensation - Additional information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended				12 Months Ended		12 Months Ended																										3 Months Ended		12 Months Ended			2 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 Employee	Sep. 30, 2013 Long Term Incentive Plan [Member]	Dec. 31, 2013 Long Term Incentive Plan [Member]	Dec. 31, 2013 Employee Loans [Member]	Dec. 31, 2013 2006 Stock Incentive Plan [Member]	Dec. 31, 2012 2006 Stock Incentive Plan [Member]	Dec. 31, 2011 IPO Event-Based Awards [Member]	Dec. 31, 2013 IPO Event-Based Awards [Member]	Dec. 31, 2013 Equity Grants [Member]	Dec. 31, 2012 Equity Grants [Member]	Dec. 31, 2011 Equity Grants [Member]	Dec. 31, 2013 Equity Grants [Member] Minimum [Member]	Dec. 31, 2012 Equity Grants [Member] Minimum [Member]	Dec. 31, 2011 Equity Grants [Member] Minimum [Member]	Dec. 31, 2013 Equity Grants [Member] Maximum [Member]	Dec. 31, 2012 Equity Grants [Member] Maximum [Member]	Dec. 31, 2011 Equity Grants [Member] Maximum [Member]	Dec. 31, 2012 Equity Grants [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Equity Grants [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Class A [Member] 2006 Stock Incentive Plan [Member]	Dec. 31, 2013 Class A [Member] IPO Event-Based Awards [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Equity Grants [Member]	Dec. 31, 2013 LP Units [Member]	Dec. 31, 2012 LP Units [Member]	Dec. 31, 2011 LP Units [Member]	Dec. 31, 2013 Acquisition-Related [Member]	Dec. 31, 2012 Acquisition-Related [Member]	Dec. 31, 2011 Acquisition-Related [Member]	Dec. 31, 2013 Acquisition-Related [Member] Unvested Acquisition-Related Equity Awards [Member]	Dec. 31, 2013 Acquisition-Related [Member] Unvested Acquisition-Related Equity Awards [Member] Lexicon Deferred Compensation [Member]	Dec. 31, 2012 Acquisition-Related [Member] Unvested Acquisition-Related Equity Awards [Member] Lexicon Deferred Compensation [Member]	Dec. 31, 2011 Acquisition-Related [Member] Unvested Acquisition-Related Equity Awards [Member] Lexicon Deferred Compensation [Member]	Dec. 31, 2011 Acquisition-Related [Member] Class A [Member]	Dec. 31, 2013 2012 Equity Grants [Member] Service-Based Awards [Member]	Mar. 31, 2012 Deferred Cash Program [Member]	Mar. 31, 2011 Deferred Cash Program [Member]	Dec. 31, 2013 Deferred Cash Program [Member]	Dec. 31, 2012 Deferred Cash Program [Member]	Dec. 31, 2011 Deferred Cash Program [Member]	Feb. 26, 2014 Other Share Based Awards [Member] Subsequent Event [Member]	Feb. 26, 2014 Other Deferred Cash [Member] Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Original Grant of Vested LP units (in shares)																											13,548,000
Original Grant of Unvested LP units (in shares)																											9,589,000
LP units convertible conversion ratio			1																								1
Amortization of LP Units																											$ 20,063	$ 20,971	$ 22,189
Number of shares issued (in shares)																																					1,883,000
Total compensation expense not yet recognized																																	8,561					113,469			4,706
Weighted-average period over which the compensation cost is expected to be recognized (in months)																																	18 months					20 months			16 months
Compensation expense related to acquisition related awards																														10,960	18,749	6,621
Compensation expense related to deferred cash consideration																														3,937	7,216	2,455
Grant of acquisition related deferred compensation																																		1,892
Deferred compensation, vesting period (in years)																																		2 years
Expense related to acquisition related deferred compensation																																		211	875	413
Stock authorized under plan (in shares)																								20,000,000
Additional shares authorized (in shares)		5,000,000
Shares available to be granted in future (in shares)									7,323,000	4,667,000
RSU's fully vested but not delivered (in shares)																								525,000
Original grant of event based awards (in shares)																									2,286,000
RSUs convertible into Class A common Stock ratio																									1
Unvested awards (in shares)												12,000	6,680,000	7,972,000
Vesting of Event-based Awards											11,467
Awards forfeited (in shares)											27,000		60,000									256,000	76,000			60,000
Deferred cash awards granted																																							3,926	9,153					5,935
Deferred compensation, vesting period (in years)																																									4 years
Compensation expense related to deferred compensation program																																									3,804	4,210	1,938
Shares issued during period (in shares)													2,398,000									3,163,000	2,273,000			2,398,000																		1,767,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value																$ 26.60	$ 22.62	$ 21.93	$ 55.24	$ 29.19	$ 36.41
Vested units (in shares)											546,000		3,630,000									1,760,000	1,552,000			2,188,000
Compensation expense related to Service-based Award														62,840	47,299											79,678
Modification of Unvested Award (in shares)																							97,000
Modification of Vested Award (in shares)																							37,000
Share based awards reclassified from additional paid-in-capital to other current liabilities					2,828
Income tax benefit related to share-based compensation arrangements			29,497	26,773	19,423
Awards, vesting period (in years)																																												4 years
Requisite service period (in years)								one
Maximum contractual term (in years)								five
Deferred Compensation Arrangement Compensation expense							1,584	7,433
Deferred Compensation Arrangement Recorded liability								13,378
LP Units, Transfer Restrictions Released (in shares)	1,267,000
Restricted Class A shares, transfer restrictions released (in shares)	610,000
Separation expense to certain employees			4,834	7,273
Cash distribution for separation benefit			3,314	5,135
Number of employees with modified equity based compensation awards					4
Incremental Compensation Expense From Modifications					$ 4,261
Long Term Incentive Plan Performance Period						4 years
Long Term Incentive Plan Payment Period						2 years