Financial Instruments - Summary of Changes in Level 3 (Detail) $ in Thousands  | 
6 Months Ended | 
|---|---|
| 
 Jun. 30, 2015  
USD ($) 
 | |
| Fair Value Financial Liabilities, Level 3 Activity [Roll Forward] | |
| Net gain (loss) attributable to contingent consideration | $ (132) | 
| Fair Value Measurements Recurring [Member] | Estimate of Fair Value Measurement [Member] | Contingent Consideration [Member] | |
| Fair Value Financial Liabilities, Level 3 Activity [Roll Forward] | |
| Beginning balance | 265 | 
| (Gain) loss recognized in earnings | (132) | 
| Ending balance | $ 133 | 
| X | ||||||||||
- Definition Fair Value Financial Liabilities, Level 3 Activity [Roll Forward] No definition available. 
  | 
| X | ||||||||||
- Definition Net Gain (Loss) Attributable to Contingent Consideration No definition available. 
  | 
| X | ||||||||||
- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  |