Stock-Based Compensation Impact on Company Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock-based compensation expense	$ 4,732	$ 3,725	$ 2,684
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock-based compensation expense	1,443	1,167	742
Selling, general and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock-based compensation expense	$ 3,289	$ 2,558	$ 1,942