Financing Arrangements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Wells Fargo Bank
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 0	$ 0
Maximum borrowing capacity of line of credit agreements	30,000,000
Line of credit Maturing date	Jun. 09, 2014
Cash flow leverage ratio required	3.0
Cash flow leverage ratio base amount	1.0
Minimum cash, cash equivalents and investments to be maintained by the company	25,000,000
Minimum cash, cash equivalents and investments to be held with the agent or its affiliates	10,000,000
Percent value of cash, cash equivalents and investments held by foreign subsidiaries	65.00%
Maximum amount of capital expenditures	85,000,000
Variable interest rate	2.50%
Commitment fee percentage	0.375%
International Commercial Banks
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	0	0
Maximum borrowing capacity of line of credit agreements	$ 11,400,000