Share-Based and Other Deferred Compensation Summary of Activity Related to Share-Based Payment Awards (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Acquisition-Related [Member]
Number of Shares
Unvested Balance at beginning of period	1,719
Granted	27
Vested	(619)
Unvested Balance at end of period	1,127
Grant Date Weighted Average Fair Value
Unvested at beginning of period	$ 39,338
Granted	1,221
Vested	(14,395)
Unvested at end of period	26,164
Equity Grants [Member]
Number of Shares
Unvested Balance at beginning of period	7,972
Granted	2,398
Forfeited	(60)
Vested	(3,630)
Unvested Balance at end of period	6,680
Grant Date Weighted Average Fair Value
Unvested at beginning of period	196,868
Granted	75,229
Forfeited	(1,789)
Vested	(88,706)
Unvested at end of period	$ 181,602