Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 5,204,000	$ 4,500,000
Additions based on tax positions related to the current year	496,000	852,000
Additions based on tax positions related to prior years	681,000	152,000
Reductions based on settlements of tax positions related to the prior year	(292,000)	(30,000)
Reductions for tax positions as a result of a lapse of the applicable statute of limitations	(1,076,000)	(263,000)
Other	(27,000)	(7,000)
Balance at December 31	$ 4,986,000	$ 5,204,000