Income Taxes - Differences Between Income Taxes Using Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	2.54%	2.36%	1.58%
Impact of differences in foreign tax rates	(20.41%)	(20.00%)	(14.99%)
Goodwill Impairment	15.29%	15.19%	0.00%
Amortization of stock-based compensation	0.47%	(1.15%)	1.67%
Non-deductible transaction fees	0.00%	0.00%	1.29%
Valuation allowance release	0.00%	0.00%	(0.14%)
Other items not individually material	(1.92%)	(1.02%)	1.41%
Effective Income Tax Rate, Continuing Operations, Total	30.97%	30.38%	25.82%