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Fair value measurements - Roll-Forward of Fair Value of the Company's Contingent Consideration Obligations (Detail) - Significant unobservable inputs (Level 3) [Member] - Contingent consideration obligations [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 6,796
Changes in fair value 2,188
Reclassification to accrued expenses (1,000)
Ending balance $ 7,984