Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Summary of Lease Exit Accruals (Detail)

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Commitments and Contingencies - Summary of Lease Exit Accruals (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Beginning balance $ 9,790
Lease exit expense 2,157
Payments (3,592)
Lease buyout/other (1,877)
Ending balance $ 6,478