Schedule of Stock Compensation Plan Activity (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Awarded	2,110	1,844	1,936
Forfeited	(122)	(204)	(435)
Outstanding at January 1	3,841	5,335	7,194
Granted	213	151	145
Assumed from acquisition			2,828
Exercised	(1,220)	(1,396)	(965)
Forfeited	(104)	(203)
Cancelled	(24)	(46)	(3,867)
Outstanding at December 31	2,706	3,841	5,335
Vested and expected to vest at December 31	2,694	3,785	4,904
Exercisable at December 31	1,814	2,004	1,844
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Non-vested at January 1	4,970	5,840	6,963
Awarded	2,110	1,844	1,936
Vested	(2,322)	(2,510)	(2,624)
Forfeited	(122)	(204)	(435)
Non-vested at December 31	4,636	4,970	5,840