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Fair Value Measurements - Reconciliation of Beginning and Ending Balances of Contingent Consideration Liability Categorized Under Level 3 of Fair Value (Detail) - Contingent Consideration Liability [Member]
6 Months Ended
Jun. 30, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Opening balance December 31, 2014 $ 747,000
Transfers into level 3 0
Transfers out of level 3 0
Total (gains) losses for period: Included in net income 0
Total gains or losses for period: Included in other comprehensive income 0
Purchases 0
Sales 0
Settlements 0
Issuances 0
Closing balance June 30, 2015 $ 747,000