Income Taxes - Reconciliation of the Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	35.00%	35.00%	35.00%
Increase (decrease) in tax resulting from:
State tax provision, net of federal benefit	3.40%	4.90%	3.10%
Non-deductible expenses	3.30%	0.60%	1.60%
Tax-exempt interest income	(0.10%)	(0.50%)	(0.40%)
Stock option compensation deduction	2.00%	0.70%	0.60%
Change in valuation allowance	0.50%	(0.80%)	1.10%
Exchange rate gain		(0.30%)	(0.50%)
Foreign tax rate differential	(4.90%)	(2.70%)	(1.00%)
Foreign tax credit	(3.70%)	(0.90%)	(1.60%)
Benefit upon audit settlement		(21.10%)
Other, net	(0.60%)	3.30%	2.60%
Effective tax rate	34.90%	18.20%	40.50%