v2.4.0.8
Fair Value Measurements - Additional Information (Detail)
3 Months Ended
Mar. 31, 2014
Business Combination Contingent Consideration Arrangements [Abstract]  
Acquisition of ownership interest in PRISM Aug. 01, 2012
Description of contingent consideration arrangements Contingent consideration, based on management's best estimate of fair value and future performance results on the acquisition date and is to be paid in 24 months following the acquisition date.
Contingent consideration payment period 24 months
Business acquisition contingent consideration discount rate for payments 4.75%
Description of sensitivity of fair value A 1% increase or decrease in our discount rate would not result in a material change in fair value.
Sensitivity change to fair value by percentage 1.00%