Summary of Significant Accounting Policies (Stock-Based Compensation) - Additional Information (Detail)	6 Months Ended
Jun. 30, 2016 shares
Restricted Stock Units to be Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that may be received by RSU holder	1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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