Liability for Income Taxes Associated with Uncertain Tax Positions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Gross liability for uncertain tax positions at beginning of year	$ 11,267	$ 8,204	$ 9,974
Gross increases—uncertain tax positions in prior periods	55	180	859
Gross increases—current period uncertain tax positions	3,279	4,649	375
Gross decreases—audit settlements during year	(2,515)	(648)	(1,889)
Gross decreases—expiration of audit statute of limitations	(1,555)	(1,118)	(1,115)
Gross liability for uncertain tax positions at end of year	$ 10,531	$ 11,267	$ 8,204