Schedule of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 18,666	$ 19,391	$ 11,777
Tax positions for current year	4,586	459	6,131
Tax positions for prior years	2,112	2,259	1,065
Acquired tax positions			1,388
Tax positions for prior years	(4,161)	(3,443)	(970)
Settlements with tax authorities
Ending Balance as of December 31	$ 21,203	$ 18,666	$ 19,391