Income Taxes - Reconciliation of Beginning and Ending Gross Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 17,377	$ 23,199
Additions based on tax positions related to the current year	1,932	1,001
Additions for tax positions of prior years	3,761	8,928
Reductions for tax positions of prior years - Settlement	(2,490)	(640)
Reduction for tax positions of prior years - Statute of limitations	(1,941)	(15,111)
Balance at end of year	$ 18,639	$ 17,377