Property, Plant and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Plant And Equipment Useful Life And Values [Abstract]
Depreciation	$ 16,885,000	$ 14,116,000	$ 11,451,000
Depreciation expense for capitalized computer software costs	7,300,000	5,700,000	4,100,000
Unamortized computer software costs	$ 24,600,000	$ 19,000,000